298:
306:
175:
80:
39:
290:
376:
Simple peepholes may allow people outside to see inside. A fisheye lens offers little visibility from the outside, but that can be defeated using a peephole reverser. Some peepholes have a shutter that falls down on the hole when nobody inside is holding it. Digital peepholes have a camera outside
388:
glass screen. An inside viewer can see the other side of the door from an arm's length away, rather than by peering through a small hole, while the frosted glass finish makes it impossible for someone to look through from the outside. There are drawbacks to the projection method: the area to be
344:
is a small, round opening through a door from which a viewer on the inside of a dwelling may "peek" to see directly outside the door. The lenses are made and arranged in such a way that viewing is only possible in one direction. The opening is typically no larger than the diameter of a
90:
360:
or hotel rooms, a peephole enables to see outside without opening the door nor revealing one's presence. Glass peepholes are often fitted with a
297:
276:
258:
66:
380:
Another design to prevent people outside from seeing in involves the outside-facing lens projecting an image onto a semi-opaque
196:
105:
433:
239:
148:
211:
120:
185:
346:
192:
52:
218:
127:
389:
viewed must be well lit, and installation requires a much larger hole in the door than a traditional peephole.
20:
428:
225:
134:
27:
207:
116:
305:
405:
310:
377:
and an LCD screen inside, without any information going from the inside to the outside.
232:
141:
422:
381:
365:
58:
385:
361:
174:
79:
357:
289:
304:
296:
288:
353:
168:
73:
32:
301:
Barack Obama looking through the Oval Office door peephole
97:
101:
199:. Unsourced material may be challenged and removed.
8:
106:introducing citations to additional sources
67:Learn how and when to remove these messages
26:For the computer compiler techniques, see
277:Learn how and when to remove this message
259:Learn how and when to remove this message
96:Relevant discussion may be found on the
398:
412:, July 1950, p. 153, right-side.
7:
197:adding citations to reliable sources
19:For the System of a Down song, see
16:Small, round opening through a door
14:
48:This article has multiple issues.
173:
89:relies largely or entirely on a
78:
37:
184:needs additional citations for
56:or discuss these issues on the
1:
372:Preventing inside viewability
309:Door viewer in the gate of
450:
406:Peephole Is One Way Viewer
349:(0.7 inches, 18 mm).
25:
18:
21:System of a Down (album)
293:View through a peephole
313:
302:
294:
308:
300:
292:
28:peephole optimization
193:improve this article
102:improve this article
434:Security technology
314:
303:
295:
368:from the inside.
364:to allow a wider
287:
286:
279:
269:
268:
261:
243:
167:
166:
152:
71:
441:
413:
403:
311:Vaxholm Fortress
282:
275:
264:
257:
253:
250:
244:
242:
201:
177:
169:
162:
159:
153:
151:
110:
82:
74:
63:
41:
40:
33:
449:
448:
444:
443:
442:
440:
439:
438:
419:
418:
417:
416:
410:Popular Science
404:
400:
395:
374:
283:
272:
271:
270:
265:
254:
248:
245:
202:
200:
190:
178:
163:
157:
154:
111:
109:
95:
83:
42:
38:
31:
24:
17:
12:
11:
5:
447:
445:
437:
436:
431:
429:Door furniture
421:
420:
415:
414:
397:
396:
394:
391:
373:
370:
356:, usually for
285:
284:
267:
266:
181:
179:
172:
165:
164:
100:. Please help
86:
84:
77:
72:
46:
45:
43:
36:
15:
13:
10:
9:
6:
4:
3:
2:
446:
435:
432:
430:
427:
426:
424:
411:
407:
402:
399:
392:
390:
387:
383:
378:
371:
369:
367:
366:field of view
363:
359:
355:
350:
348:
343:
339:
335:
331:
327:
323:
319:
312:
307:
299:
291:
281:
278:
263:
260:
252:
241:
238:
234:
231:
227:
224:
220:
217:
213:
210: –
209:
205:
204:Find sources:
198:
194:
188:
187:
182:This article
180:
176:
171:
170:
161:
150:
147:
143:
140:
136:
133:
129:
126:
122:
119: –
118:
114:
113:Find sources:
107:
103:
99:
93:
92:
91:single source
87:This article
85:
81:
76:
75:
70:
68:
61:
60:
55:
54:
49:
44:
35:
34:
29:
22:
409:
401:
379:
375:
362:fisheye lens
351:
341:
338:magic mirror
337:
333:
329:
325:
321:
317:
315:
273:
255:
249:October 2017
246:
236:
229:
222:
215:
203:
191:Please help
186:verification
183:
158:October 2017
155:
145:
138:
131:
124:
112:
88:
64:
57:
51:
50:Please help
47:
342:door viewer
423:Categories
393:References
358:apartments
219:newspapers
208:"Peephole"
128:newspapers
117:"Peephole"
53:improve it
334:magic eye
98:talk page
59:talk page
330:doorhole
322:peekhole
318:peephole
382:frosted
326:spyhole
233:scholar
142:scholar
386:ground
235:
228:
221:
214:
206:
144:
137:
130:
123:
115:
352:In a
240:JSTOR
226:books
149:JSTOR
135:books
354:door
347:dime
212:news
121:news
384:or
340:or
195:by
104:by
425::
408:,
336:,
332:,
328:,
324:,
320:,
316:A
62:.
280:)
274:(
262:)
256:(
251:)
247:(
237:·
230:·
223:·
216:·
189:.
160:)
156:(
146:·
139:·
132:·
125:·
108:.
94:.
69:)
65:(
30:.
23:.
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
