such lenses therefore necessarily have variable focal lengths. How is the focal length of such lenses varied?
2007-02-24 19:41:13 · 5 answers · asked by kafka 1 in Science & Mathematics ➔ Physics
True. It's done by varying the geometry of the lenses in the lens system. They're moved closer and further apart as required.
Doug
2007-02-24 19:46:49 · answer #1 · answered by doug_donaghue 7 · 0⤊ 0⤋
Zoom lenses form a combination of 2 lenses. Its the focal length of this 2 lens system that varies. It is achieved by moving the outer lens farther and closer to the camera. You can see this lens moving in most of the cameras with optical zoom.
2007-02-24 22:48:04 · answer #2 · answered by shyam k 1 · 0⤊ 0⤋
1) correct.
2) by moving the first lense towards or from the second lense.
2007-02-24 19:45:02 · answer #3 · answered by gjmb1960 7 · 0⤊ 0⤋
Simply one lens is stationary, the one closet to the camera, the other one is slid in and out. The further the lens is moved out, the subjects further away will come into shaper focus. Chow
2007-02-24 19:48:38 · answer #4 · answered by Clipper 6 · 0⤊ 0⤋
study your preparation manual, you will have the skill to make some adjustment to the intensity of section and get that. additionally, cameras have unique interest modes, comparable to portrait, panorama, and many others. Portrait works good for that. you will not have a DSLR or another applicable end digital camera, what you have got could be smart. Even my $89.00 ingredient a shoot can accomplish this (little choose for my DSLR).
2016-12-14 05:08:36 · answer #5 · answered by ? 4 · 0⤊ 0⤋