technoguy

A photographic lens (also known as objective lens or photographic objective) is an optical lens or assembly of lenses used in conjunction with a camera body and mechanism to make images of objects either on photographic film or on other media capable of storing an image chemically or electronically.

Desiree

Do you know if the refraction of light is setup differnetly in a mechanical device vs. a digital?

Trinity

So a telephoto lens---used for getting close up is the same tech as a telescope and microscope------Their display is not often stored---how does this differ when the lense is the same?

Desiree

I dont know I am really curious on how it all works

Desiree

I guess the thing that interests me the most is the digital device.

vipl

In a telephoto lens is a lens whose focal length is significantly longer than the focal length of a normal lens. Telephoto lenses are best known for making distant objects appear magnified. The actual appearance is such that the telephoto lens compresses the distance between objects. Telephoto lenses also have less depth of field at a given aperture than shorter lenses and so require more precise focusing. Optical designs of telephoto lenses must contain a telephoto group, which allows the lens to be physically shorter than its focal length.