1284:(tilge) characters. As to the questions, I have reviewed several blogs at the CloudyNights telescope review pages, and consistenly owners of quality telescope systems that have emailed the manufacturers often ask about the non-spherical surfaces, and some have received replies that you can read at the blog about the optical designs being a propriety priveledge & company secret with patents pending, so that many of the complex lens systems being studied that use aspheric, parabolic, and hyperbolic curvatures are tested for specific purposes at the manufacturer, depending on wavelength, coma, spherical abberation, chromatic abberation, refractive index, ect. The "best" fit is what makes it to the market place for consumers buying the product, and they are not perfect, but are the best known combinations that theory can employ.
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1863:"Verification needed" means that someone needs to actually go check the cited sources and verify that they say what the article claims. There was a problem a few years ago with an enthusiastic editor who added a lot of material about Ibn Sahl and other Islamic scientists and mathematicians to many Knowledge articles. The editor's contributions contained many citations, but on closer examination many of the claims were not adequately supported. I presume the "verification needed" tag is a leftover from that incident, but some digging would be needed to figure out whether this claim is properly supported.
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phases being collimated before reaching
Cardinal points (optics) for higher definition and point to point traversal of successively smaller diameter optical tubes, there isn't any easier way to express these compound abstracts, except to try and put them together. In terms of pixels, high definition is considered to be 1920 X 1080. This is difficult at best to describe in terms of a distant source emitting individual collimated light rays that reach a complex lens system.
828:, the descriptions are not reflecting, less refracting, and more of a warp of electromagnetic flux that funnels into successively smaller diameters of re-collimated waveforms, ultimately reaching an array with enough energy to trigger components that begin the initial electronic processing used to interpret point-to-point facsimiles of objects several light years wide upon sensor arrays that detect infra-red, ultra-violet, and visible light spectrums.
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array was determined by a count of Newton rings. They go on to say that image details are limited only by available computing power, based on the software program running (256)^2 attributes per pixel in an array of 1920X1080 pixels at 30 fps. This optical system does not use any reflecting lenses, and the array being flat limits it's use solely to astronomical surveillance.
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know how Ibn Sahl expressed this without knowing trigonometric functions. It is well explained in the Ibn Sahl
Knowledge article.) I stumbled on this passage and I felt it is awkward as it is - still do - but did not want to change this before checking on the talk page. I believe the BBC professor but if there are strong feelings a about this, I leave it as is. Wkr.
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products are confounding the advancements of study in this improvement of systems requiring delicate ray tracing techniques, understanding of aberrations, indices, impurities, entrance/exit pupils, and criteria generally studied in the field of
Physics under academic scrutiny, but not limited from commercial, or ophthalmic applications.
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the definition of quantities. Very few texts give a chart of definitions: they only include the inference from context building an equation. Most useful would be a legend of the math symbols, units, tolerances, and other properties. From the standpoint of engineering, a legend would seem more practicle & less theoretical.
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error—a misalignment between the optical centers of the two surfaces. The blanket statement that "the lenses are so well produced..." is clearly contradicted by this source, so I have removed it. I highly doubt that that statement would be true of even the best of the lenses, impressive as its imaging quality may be. --
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Dear
Srleffler. I will leave this as is, and neither verify nor modify. I do not want to become involved in a controversy around this. (I am not a specialist in this field. I had heard a professor in the history of science state on the BBC radio that Ibn Sahl discovered Snell's law, and I wanted to
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I am pretty sure this formula is wrong. z cannot be as defined as it does not reduce to a sphere for any value of k (with the As zero). I think z(r) is meant to be the
Saggital Distance, often called SAG, not as it is at the moment "the z-component of the displacement of the surface from the vertex,
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Now, consider if the Hubble Space telescope were designed to retrieve 1920 X 1080 individual collimated light rays, and without "folding" them, avoid any interference between neighbors & fit each & all the rays onto a rectangle 2/3" in width, with a 16:9 aspect ratio for the new ATSC plasma
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Conflicts in the description of aspheric lenses and their use exist mainly from the discovery of use needing techniques to determine their improvement of optic systems, a subjective process that may involve deciding which "looks best", 1 or 2. Wholesale commercialization by manufacturers promoting
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That may have been too harsh. His edit looks like it was done in good faith to me. Looking at the article, I can see that someone who primarily knows about ophthalmic optics might find it lacking. The section "Non-optical advantages of aspheric eyeglass lenses" is particularly bad, but I don't know
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article contained some statements that were not supported by the cited sources. The
Schmidt reference cited there describes a study of seven of the lenses, only two of which showed signs of having been optimized for good image quality, and one of the two "good" lenses had an apparent manufacturing
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There are now several extremophile lens systems out there where the projected image is bent at nearly an 80-degree angle towards the bottom of the screen, from a wall mounted projector directly above the screen without any arm holding it out in space a meter or more away. I am really interested to
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Yes, this is where math often fails in working with optics. Because the variables are measurements indexed in units defined by previous work, we're using values that rarely match calibrations used to categorize power, curvature, and other properties. The textbooks leave little comfort concerning
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Other surface profiles can be used; in general the form is somewhat arbitrary. Optical software models propagation through NURBS surfaces, so in principle these could be used for aspheric lenses, but in practice they are not well suited to numerical optimization. NURBS is more useful for exporting
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Lord
Oxmantown's team worked primarily on the metalurgy to create the surfacing machine that produced the larger diameter reflecting lens. His inclinations toward the end of the publication were towards testing parabolic form. Concerning modern ray tracing, and individual ray's particle waveform
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These notes did not conclude with why the Hubble is obsolete. They continue to describe a flat array of sensors, each fitted with composite optical tubes that resist internal reflections but are durable in extreme conditions, where precision of the flatness of the sensor plate that contains the
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I added a section for discussing camera lenses and moved the information on the abbreviation there. I removed the list of camera lenses. I don't see a list of every aspheric camera lens ever made to be a useful addition to the article. I also question whether
Knowledge ought to have articles on
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You answer your own question as if to beg to differ, and leave no quadruple tilge as requested when adding comments for your screen name to be identified. Identifying yourself would allow others to make comments on your talk page. When making any additions, please sign your comments with 4 ~
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The "See also" section lists
Hyperbola and Parabola. While it's obvious at least the left surface of the lens shown on the picture is neither hyperbolic nor parabolic. Why the hyperbola and parabola are here? What's the typical shape of the lens surface? Is it а 3-4 degree polynomial, or just
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Not quite sure what you're getting at there. Light rays do not really exist. They are a convenient abstraction for modeling, that represent some but not all of light's properties. The number of "rays" one considers in an optical system has nothing at all to do with the number of pixels on the
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Not non-sense, just hard to make sense of modern development . . . difficult to understand the context of ray tracing used here in reflecting telescopes as they increase the diameter of the reflecting lens, and improve on imaging systems. In particular improving designs like the Hubble Space
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for telescopes. His achievement in that regard was in developing a way to produce large mirrors that deviated from spherical form while retaining good optical figure (thereby having reduced spherical aberration). The rest of your paragraph above doesn't make any sense to me at all. It seems
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An aspheric lens in ophthalmic optics don't always have rotationally symmetric surfaces. For the correction of astigmatism an aspheric ophthalmic lens has a single aspheric surface with rotational symmetry, and a toroidal surface which is not rotational symmetric. Some lenses even have a
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Please don't move this page to "Aspherical lens" (which now redirects to this article). The universal term for these in the optics industry is (AFAIK) "aspheric lens" (or "asphere"). I just did a quick survey of a half dozen major optics vendors. Every single one uses the latter
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Amplification of details produced not so much by a point of focus, but by the concentration of light rays within an optical tube, still separated and not having crossed paths before coming to focus, compressed into tubes of successively smaller diameter, and remaining
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There is a 'verification needed'. after the statement that Sahl first discovered Snell's law. This puzzles me as there are two bona fide references. The scame ststatement is in the article on Sahl. I suggest to remove the verifiication request. Objections?
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my comments come from, reading hundreds of posts on
Optiboard forum. I will try to cite something, but it is difficult, as there is much conflicting info, and lots of advertising copy. Apologies to everybody,BTW. None of my comments apply to photography lenses.
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Yes, you're correct, and this was exactly the right place to put your comment. I think the notation in the formula is better, since the surface profile is really a function of radius, not height. We should probably edit the image or replace it with a better
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I thought it was harsh of him to call the article complete BS and then add unsupported claims to the lead, with a misspelling of a word that one knowledgeable in this field should be very familiar with. So I figured it was good to challenge him to fix it.
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No a $ 700 DSLR lens doesn't fit into an inexpensive consumer camera. If it contains a single molded asphere, they are charging way too much for it. Molded glass aspheres cost about $ 50 in small quantities; maybe half that in volume. Plastic lenses are
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I am trying to figure out who manufactures ultra short throw lenses, and I'm trying to find some sort of history or discussion of how they are developed. I work with these on a regular basis and I am interested to know where the technology originates.
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I removed the paragraph again. Let's work out wording here before reinserting it into the article. As it stands, I can't even tell what you are trying to say, much less evaluate whether it is correct. Either way, it is not supported by a
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The style of the article is written in an unencyclopaedic manner. There appears to be an account of a personal experience in the first person. Also, the diagram in the middle of the article is not well drawn. Can anyone improve on this?
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OK, most of the article is not BS. Eyeglasses only, aspherics offer a reduction in thicknesss of 20% or so, at the expense of increased off-axis astigmatism and different geometric distortion, as compared to a spherical base (front)
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Just to add a value to this last question, most literature use a variable "z" for curvature (z = 1/R) so as the colleague said, for evaluating formulation is more clear to use the first one, and contribution in the root is small.
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prevents an editor from repeatedly inserting or deleting the same material over and over again. Any editor who reverts edits on one article more than three times in a 24 hour period can be blocked from further
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non-rotationally symetric aspheric surface (eg. a biaspheric ophthalmic lens for the correction of astigmatism) The term "whose surfaces have a profile that is rotationally symmetric" should be removed.
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summarily produce a better facsimile of an object from point to point without interference between each ray's particle waveform phase at the final point of focus upon a grid of light sensors, ie. the
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Do you know of a reference (print or online) that supports that? I don't doubt your claim, but it's helpful to Knowledge to be able to back up the information that appears in the articles.--
708:. While it is aspheric, it is off-topic for this article because it is not a lens. It's an interesting paper, though. It's clear he was aware in advance of the desirability of a
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of the surface. Simple aspheres may have zero for all the alpha coefficients, in which case the surface is elliptical, hyperbolic, or parabolic depending on the value of
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screens, maintaining original ray particle waveform phase during the complex lens system processing, until it can converge onto the chip, and be digitally cinemagraphed.
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He did sign his post properly. He isn't editing from a user account, so the software signs his message with his IP address instead of a username. This is normal.--
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know what the shape profile is of these lenses and how the lenses are being manufactured, and it would probably make a useful addition to this article as well.
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Since the lenses are permanent components of projectors, the projector manufacturers have no need or desire to tell where they get their lens assemblies from.
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The shape is typically optimized for the particular application using a raytracing application on computer. One common formula for the shape of the surface is
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That's what I was afraid of. We can't have you putting in stuff that learned from reading forums. That's just hearsay, not backed up by anything reliable.
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BTW $ 700 DSLR lenses are much more complex then just a single asphere. Look at this one (sony 18-250) I was keeping in mind when I was asking my question:
748:. Reflecting optics work a lot better for telescopes than they do for camera lenses. Many of their defects are not relevant for astronomical photography.--
1105:{\displaystyle z(r)={\frac {r^{2}}{R\left(1+{\sqrt {1-(1+K){\frac {r^{2}}{R^{2}}}}}\right)}}+\alpha _{1}r^{2}+\alpha _{2}r^{4}+\alpha _{3}r^{6}+\cdots ,}
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I certainly object to simply removing the verification request without further research. Either verify the claims, or remove the material altogether.--
1685:"Sagittal Depth. Sagittal depth is the distance from the vertex of the contact lens surface to a chord drawn across the surface at a known diameter."
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as I still haven't found it elsewhere. I wonder if anyone knows of a paper explaining why this series is a good one for optimising aspherical lenses?
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to fit with the formula? (Forgive me my ignorance, these are one of my first words on Knowledge and I didn't find another place to put my comment)
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Do modern $ 700+ DSLR lenses fit into "inexpensive consumer cameras" ? If no then what manufacturing method use companies like tamron and sony?
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Sounds like something that might well be proprietary: the projector manufacturers may well design their own lenses and have them custom-made.--
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The Diagram has been modified by the original auther, so as part of tidying up the Reqdiagram page, I am removing the Diagram Requested tag.
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866:, or complete nonsense. Fortunately, it seems to be completely off-topic for this article, so no further analysis of it seems necessary.--
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When you have finished reviewing my changes, you may follow the instructions on the template below to fix any issues with the URLs.
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Thinking about this further, I'm not sure that the entire present "astronomical uses" section shouldn't be deleted. This article is
1981:, these subpages are now deprecated. The comments may be irrelevant or outdated; if so, please feel free to remove this section.
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https://web.archive.org/web/20141006154248/http://www.looklens.com/camera-lens-tips/what-do-aspheric-or-aspherical-mean-3.html
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That seems fine. The other form might be preferred because it makes the behaviour clear in the important limiting case where
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detector. The performance of the system is limited by design and fabrication constraints, and by fundamental physics such as
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i.e. move R into the brackets, and thence R^2 inside the sqrt. It reduces the nesting level of both brackets and fractions.
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1911:: (The lenses) are so well produced that even computer optimisation has not been able to improve their performance.
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Powerful words from someone who can't spell. I'm going to back out your change until you tell us what's behind it.
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lenses designed using some other definition of surface form (like the formula above), for use in a CAD program.--
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Preserving the integrity of parallel light paths may involve not bombarding them into the same converging point.
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http://www.opticampus.com/cecourse.php?url=lens_design/&OPTICAMP=f1e4252df70c63961503c46d0c8d8b60#asphericity
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to delete these "External links modified" talk page sections if they want to de-clutter talk pages, but see the
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for an article entitled Mirror Lenses (Technology - Technology). It describes flaws in reflecting telescopes.
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go down about 90% of the page, to 'Aspheric Lens Design'. Uf you have something more reliable, please indicate.
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Would that equation not be more simply expressed as (and I hope I don't fark this up, please double-check)
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If you have discovered URLs which were erroneously considered dead by the bot, you can report them with
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enough about it to rewrite it. If CorvetteZ51 does know something about it, he may have a lot to add.--
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The diagram needs to have definitions for all the quantities e.g. R is the radius of curvature, etc.
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on Knowledge. If you would like to participate, please visit the project page, where you can join
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on Knowledge. If you would like to participate, please visit the project page, where you can join
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Apology accepted, as Stephen Colbert would say. So find us a good source and write that up.
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from a distant source so an image has not yet converged, and light paths have not crossed
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are by definition short. Anything longer than about a screenful of text is not a stub.--
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This article could have sooooo much more information. I'm marking it an optics stub.
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Last edited at 23:55, 28 June 2007 (UTC). Substituted at 08:27, 29 April 2016 (UTC)
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These two pages contradict each other on the optical quality of the Visby lenses:
721:(assuming the material is actually relevant to the article, and otherwise suitable).
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Please don't reinsert the paragraph until we discuss it further here. Note that the
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http://www.looklens.com/camera-lens-tips/what-do-aspheric-or-aspherical-mean-3.html
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Thanks in advance to anyone with the competence and willing to update the article.
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671:. But I agree that the astronomical mirror stuff is probably out of place here.
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There is also something wrong with the history. Newton made a telescope with at
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2051:. No special action is required regarding these talk page notices, other than
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This topic migrates from aspheric to afocal, but unlike current material on
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http://www.photoreview.com.au/reviews/cameraaccessories/optical_diagram.jpg
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I concur, the term Aspheric has entered into mainstream use in optometry.
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What is this paragraph trying to say? The wording is very confusing. --
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being scheduled for deployment in 2013 aboard Orion class vehicles.
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1907:: The Visby lenses...exhibit a wide variety of image qualities....
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Yes thanks, I am convinced now. I wrote out a quick derivation here
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I'm familiar with photographic mirror lenses. They are discussed at
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It's not a reflecting lens. It's a reflecting mirror, made of solid
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for additional information. I made the following changes:
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566:"Ray Tombes' - Harmonics Theory - The Physics and Math"
1651:) is the sag. I'm pretty sure the formula is right.--
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Catadioptric system#Photographic catadioptric lenses
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667:Actually, Newton's was spherical according to
627:. The telescopes described are using aspheric
204:Knowledge:WikiProject Physics/Taskforces/Glass
1971:The comment(s) below were originally left at
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1952:individual specific models of camera lens.--
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263:"The best ideas are common property."
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474:D., you will find this interesting.
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1725:Ultra short throw projector lenses?
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2015:. Please take a moment to review
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498:Thanks, looks like an OK source.
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2008:Hello fellow Wikipedians,
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141:project's importance scale
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1993:23:55, 28 June 2007 (UTC)
1986:
1764:00:37, 28 June 2011 (UTC)
1749:10:24, 27 June 2011 (UTC)
882:A questions unclear to me
508:16:04, 1 March 2008 (UTC)
491:11:55, 1 March 2008 (UTC)
266:02:16, 18 July 2007 (UTC)
223:
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67:
46:
2123:C-Class physics articles
1835:10:44, 1 June 2014 (UTC)
1308:04:01, 3 June 2009 (UTC)
1294:03:50, 3 June 2009 (UTC)
1271:21:04, 2 June 2009 (UTC)
1253:Srleffler, thanks a lot!
1157:—the z-component of the
552:Cardinal points (optics)
2004:External links modified
1245:03:39, 2 May 2009 (UTC)
905:22:58, 1 May 2009 (UTC)
2138:C-Class glass articles
1492:
1225:, which is called the
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1195:
1175:
1147:
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583:telescope is a goal.
538:
28:This article is rated
1947:List of camera lenses
1576:Define all quantities
1493:
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2053:regular verification
1328:
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1185:
1165:
1146:{\displaystyle z(r)}
1128:
922:
796:) 04:47, 10 November
784:and conservation of
2043:After February 2018
1705:rotational symmetry
1203:radius of curvature
804:the obsolete Hubble
649:parabolic reflector
516:Confusing paragraph
98:WikiProject Physics
2097:InternetArchiveBot
2048:InternetArchiveBot
1967:Assessment comment
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34:content assessment
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1789:comment added by
1586:comment added by
1553:comment added by
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1405:
1218:{\displaystyle K}
1194:{\displaystyle R}
1174:{\displaystyle r}
1022:
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864:original research
715:original research
605:three-revert rule
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2092:
2067:source check
2046:
2040:
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2010:
2007:
1999:
1970:
1950:
1902:
1846:
1785:— Preceding
1779:
1775:
1773:
1739:
1735:
1732:
1728:
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1579:
1549:— Preceding
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1159:displacement
1154:
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40:WikiProjects
1582:—Preceding
1532:is small.--
826:digiscoping
800:2008 (UTC)
782:diffraction
483:CorvetteZ51
440:CorvetteZ51
383:CorvetteZ51
309:CorvetteZ51
2117:Categories
2104:Report bug
1928:Visby lens
1118:optic axis
1116:where the
608:editing.--
548:collimated
2087:this tool
2080:this tool
1954:Srleffler
1933:Srleffler
1883:Karloman2
1868:Srleffler
1850:Karloman2
1813:Srleffler
1791:Halirutan
1756:Srleffler
1653:Srleffler
1534:Srleffler
1300:Srleffler
1237:Srleffler
868:Srleffler
790:Srleffler
750:Srleffler
669:this book
655:Srleffler
633:Srleffler
610:Srleffler
522:Srleffler
401:Srleffler
339:Srleffler
290:Srleffler
254:Srleffler
2093:Cheers.—
1913:Pollifax
1843:Ibn Sahl
1799:contribs
1787:unsigned
1741:DMahalko
1712:Its liam
1687:Billlion
1670:Billlion
1630:Billlion
1584:unsigned
1551:unsigned
911:cheaper.
706:speculum
673:Dicklyon
651:in 1689.
500:Dicklyon
458:Dicklyon
421:Dicklyon
362:Dicklyon
324:Dicklyon
247:Untitled
2017:my edit
1827:Egmason
1504:Fatphil
1153:is the
786:etendue
629:mirrors
252:term.--
228:on the
139:on the
112:Physics
103:Physics
59:Physics
30:C-class
1811:one.--
725:Visit
556:macula
381:curve.
272:Garvin
36:scale.
286:Stubs
201:Glass
192:glass
164:Glass
1958:talk
1937:talk
1917:talk
1887:talk
1872:talk
1854:talk
1831:talk
1817:talk
1795:talk
1760:talk
1745:talk
1716:talk
1691:talk
1674:talk
1657:talk
1634:talk
1611:talk
1592:talk
1559:talk
1538:talk
1508:talk
1304:talk
1290:talk
1267:talk
1241:talk
901:talk
872:talk
853:talk
834:talk
815:talk
794:talk
770:talk
754:talk
735:talk
695:talk
677:talk
659:talk
637:talk
614:talk
526:talk
504:talk
487:talk
462:talk
444:talk
425:talk
405:talk
387:talk
366:talk
343:talk
328:talk
313:talk
294:talk
276:talk
2061:RfC
2031:to
1990:Amy
1155:sag
788:.--
220:Low
131:Low
2119::
2074:.
2069:}}
2065:{{
1960:)
1939:)
1919:)
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1483:⋯
1461:α
1438:α
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1097:⋯
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143:.
42::
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