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Phase-detection autofocus "sees" through window glasses without problems and is much more accurate, but it does not work in low-light conditions or on surfaces without contrasts or with repeating patterns. A very common example of combined usage is the phase-detection auto-focus system used in single-lens reflex cameras since the 1985s. The ...
The lensmeter is also used to check the accuracy of progressive lenses, and is often capable of marking the lens center and various other measurements critical to proper performance of the lens. It may also be used prior to an eye examination to obtain the last prescription the patient was given, in order to expedite the subsequent examination.
Adjustable focus lenses, like single-focus lenses, also reduce image-jump and spatial distortion in the field of view associated with traditional multi-focal lenses. Additionally, the ideal near-vision correction can be achieved with precision, because the variable lenses emulate the focusing action of the youthful (non-presbyopic) eye.
MF = Manual focus lenses; AF & AF-D = Auto focus by camera body driven focus motor, the D version provides distance information; AF-I & AF-S = Auto focus by integrated/ultrasonic motor in lens; see also List of Nikon F-mount lenses with integrated autofocus motors; Industrial F-mount lenses have varying, often small, film/sensor coverage.
Attaining maximum lens speed requires engineering tradeoffs, and as such, "prime" (fixed focal length) lenses are generally faster than zoom lenses. [2] With 35mm film cameras and full-frame digital cameras, the fastest lenses are typically in the "normal lens" range near 50mm; here, there are several relatively inexpensive high-quality fast ...
Working from home has become the norm for millions of people around the world and with it, comes the video conferencing and Zoom calls. While most laptops these days have built-in webcams, if you ...
A telecentric lens is a special optical lens (often an objective lens or a camera lens) that has its entrance or exit pupil, or both, at infinity. The size of images produced by a telecentric lens is insensitive to either the distance between an object being imaged and the lens, or the distance between the image plane and the lens, or both, and ...
This is a list of autofocus prime lenses designed for mirrorless cameras that measure less than 30 millimeters in length — limit one per brand and focal length combination. In 2024, Viltrox released the thinnest autofocus pancake lens ever produced for full-frame sensors: a 28mm F4.5 lens that is only 15mm thick.