Visual Doorbell/ Peephole Viewer/ Doorbell Viewer - Digital Video 3.5 Inch LCD Take Photo Display Wide Visual Angle Viewer Doorbell Peep Hole Peephole Door Viewer by OEM. $85.00. visual doorbell/ Peephole Viewer/ doorbell Viewer - Digital Video 3.5 inch LCD take photo display wide visual angle viewer Doorbell Peep Hole PeepHole Door Viewer Main features: 1. Peephole barrel (diameter):12-30mm 2. Fits any door: 42-72 or 60-90mm (thickness) 3. Screen will automatically ...
1Byone 7 Inch Color LCD Screen Video Doorbell and Home Security Camera Monitor Intercom System with 90 Degrees Wide Visual Angle
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Figure 1. Illustration of the geometrical rules of optics that express the height of the object as a proportion of the perceiver-actor’s eye height (i.e. an eye-height ratio), where Y is the object's total height, E is the portion of the object below the horizon, and y and e are the respective heights expressed as visual angles. The height of the object depends on the eye height and is expressed as a visual angle: Y/E = 1 + tan(y-e) / tan(e).