COVID-19 Update: Westech Optical services essential business and thus remains open during these uncertain times. We have implemented steps to ensure fulfillment of orders as we continue to work with our valued customers and partners. We have curtailed all travel and adopted CDC/Government recommended work practices such as instituting remote work where possible and social distancing at our facilities.
Stay safe and please contact us if you have any concerns.

Usually camera lenses are optimized for infinitely distant objects. These lenses give their best performance when an object to image distance (OI) is from 4X the focal length to about 10X the focal length.

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

To learn more about our company, our products or any of the services we offer, get in touch with Westech Optical today and we’ll be happy to get you started. You can reach us by phone at 585-377-2490 or via email by filling out our quick contact form.

Contact Us