It does not change the focal length of the system.
An 85-mm focal length was used to record the image.
But the need to consider the impact of focal length remains just as important.
But let's say you use the 28-millimeter focal length fairly often.
Do remember though, you are paying a lot of money for a camera with one single focal length.
The order is based on the focal length of the lens.
I need to know the focal length of the camera lens.
The standard lens would be of the 50mm focal length.
Variation in focal length is one of the chief benefits.
Hold up a paper in the reflected light, about two focal lengths from the mirror.
The resulting higher quality of beam can be exploited either to obtain a smaller focus diameter or a larger focal distance.
This changes the focal distance of the eye so that it can focus on objects at various distances.
The first variable-focal-length lens with fixed back focal distance for 35 mm cameras, introduced in 1964.
The shorter flange focal distance may also allow for smaller, lighter and lower cost.
The smaller flange focal distance allows for more compact normal and wideangle lenses.
An object image is calculated at a given focal distance.
The difference of the focal distances is a constant.
The interchangeable backs allowed to insert the extension rings to compensate the difference in focal distance among the various lenses.
A recessed lens board effectively reduces the flange focal distance of a camera.
Lens mounts with shorter flange focal distances are longer and heavier.