l_n_h
Newbie
We are talking here about the lenses that are removable and fit onto the camera body. Is there a general rule how such lenses are constructed? For example, I have an 1:2.8/135mm lens, which is made up like this-
Front lens / Shutter & mechanism / CI /spacer tube/ D /// Camera Body
(49mm)
where 'CI' and 'D' are small lenses which are flat on one side and convex on the left and right side respectively (and are separated by a small plastic spacer tube).
Would this be a correct arrangement for the small lenses? I presume these small lenses could be acting as a composite double-sided convex lens separated by the tube, but it requires somebody who knows optics or is familiar with cameras generally to know the answer.
The reason I ask? Because when I got this item I found that the small lenses (measuring 23mm each) had been removed for cleaning and may have been replaced wrongly -they were in a 'CI /tube/ CI' position. If anyone knows the correct positioning do let me know, since the lens logically cannot function unless it is set up right. Presumably most cameras would use the same lens arrangement.
Front lens / Shutter & mechanism / CI /spacer tube/ D /// Camera Body
(49mm)
where 'CI' and 'D' are small lenses which are flat on one side and convex on the left and right side respectively (and are separated by a small plastic spacer tube).
Would this be a correct arrangement for the small lenses? I presume these small lenses could be acting as a composite double-sided convex lens separated by the tube, but it requires somebody who knows optics or is familiar with cameras generally to know the answer.
The reason I ask? Because when I got this item I found that the small lenses (measuring 23mm each) had been removed for cleaning and may have been replaced wrongly -they were in a 'CI /tube/ CI' position. If anyone knows the correct positioning do let me know, since the lens logically cannot function unless it is set up right. Presumably most cameras would use the same lens arrangement.
