Case study: Using an achromatic objective as its own focal reducer

Commercial telescopes are more often than not provided with a focal reducer, which enables the customer to use the telescope also for astrophotography. Here I introduce two cases where a second objective unit identical to the primary unit serves as the focal reducer to the first unit which reduces not only focal length but also design and manufacturing costs.

Published 6.9.2018 by Jani Achrén, who would love to tell you more here.

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