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Usually camera lenses are optimized for infinitely distant objects. These lenses give their best performance when an object distance is at least 26X the EFL.
Westech designs and manufactures finite conjugate lenses. These lenses are optimized for magnifications from 1: 1 to around 10:1. Although you may use an infinity-corrected lens at a finite distance, it will not give its best performance. You can also use a finite lens at infinity but to get the optimum performance the lens should be matched to the correct reproduction ratio.


This design is for 1:1. Noticed the elements are symmetrical on each side of the A-stop . This lens would not work well at infinity but is a great relay lens.

This lens is designed for a 1.88:1 ratio. Notice the difference in size and shape of the elements.

Finally below is an example of a typical camera lens optimized for an object at infinity.

Let us help you choose the best stock or custom lens for your application. Don’t pay catalog prices for OEM optics. Call Westech. (585)377-2490

Finite Conjugate Lenses