Back-Focus 101: Celestron RASA 8

The Celestron RASA 8 has very specific back-focus requirements. This video shows a few different methods of obtaining the proper back-focus using ZWO cameras that have 6.5mm of back-focus built-in, from sensor to flange. These methods will also work with other cameras with similar back-focus, as long as you meet the requirements described in the video.

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