Backfocus with an ZWO Cooled Camera

Backfocus is the distance where the corrective lens of the flattener produces the optimum image quality onto your camera sensor. My refractors all had a backfocus of 55mm's and my Celestron C8 has a backfocus of 105mm.

In this video I show how I mount my image train to have the correct backfocus.

Een Nederlandse versie van deze video staat hier:    • Backfocus met een gekoelde ZWO camera  

#asiairpro #zwo #optolong #ioptron #cem40 #celestron

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