- #1

Aymangh994

- 15

- 2

Using a CCD camera and simple lenses, the probe of the cantilever and its surroundings are to be imaged. Since the cantilever is 50 um wide and some of the surroundings are to be imaged, the optimal image magnification is from 4 to 8. I therefore used a convex lens with a focal length of 88...98 mm. The object distance is 110 mm and extends over a deflection mirror.

According to the lensmarker equation, the distance to the image is 440 ... 880 mm. My question is, it is better to use a telephoto lens in this context or is a simple lens enough? The telephoto lens should then be constructed by yourself. As far as I know, this consists of a front lens and a rear lens. The front lens should be a convex lens and the rear lens should be a concave lens.

How big should be these two focal lengths in order to get a total focal length of 97mm using these two lenses. How large should be the distance between the two lenses and the distance between the rear lens and the CCD sensor?

I have another problem choosing the type of the lens (ashperical, spherical or achromatic lens) ?

Thank you and sorry for my bad english