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Bugger...
I have t adapter on the brain.. I meant T ring.. I've edited the previous post...
For example: I only use a t-adapter of 50mm when I am using a focal reducer & require 105mm of back focus... If using my flattener or coma corrector (dependant on scope being used) I only connect to my T-ring (m42 thread)... that's for my Canon 70d..
If I use my ZWO I need to factor in an additional 43mm as the sensor depth on that camera is only 12mm.. hope that makes more sense...
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