Back-Focus 101: DSLR Cameras & the Celestron f/6.3 Reducer/Corrector

Getting the proper back-focus for your imaging camera is a vital step in getting the best data possible out of your telescope imaging/research rig. This is a quick tutorial on how to achieve back focus using a DSLR camera. The Celestron f/6.3 focal reducer/corrector requires a back-focus distance of 105mm from the end of the reducer to the imaging sensor on your camera. The example camera in this video is a Canon SL1, but this will apply to all DSLR cameras as long as you get your focal distance to 105mm. For the typical DSLR with a sensor to flange distance of 45mm, all that is needed is a 10mm T-ring and a Schmidt-Cassegrain T-Adapter (50mm).

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