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Hi Daniel
I've also got my spacers in last weekend but the inclement weather has stuffed my plans
I think I've researched enough and got up to speed with the "backfocus" nonsense (not really, as it affects how much we have to make up with spacers/ext tubes etc!!) and for my Orion SSDSI Pro v1 CCD apparently the flange distance to the sensor chip is supposed to be 14.5mm - now it being that the HoTech FF is supposed to be set 55mm from the sensor chip it means I've got to bridge that 55mm less the 14.5mm with the spacers!
BTW what is your QHY8L's flange distance to the sensor?
So until I can see stars and do a PA I can't experiment anymore till then
But what is strange though is that the HoTech works OK with the 120mm OTA without my being concerned (ignorant is the correct word here!) of the spacing requirement - I actually just screwed the T2 threaded end fitting straight into the camera opening (got the idea from h0ughy here who did just that with the HoTech and his 127mm NG OTA) - and it did the job pretty good - however would not work for the 80mm OTA - perhaps the native FOV of the scope plays a part in the equation; my premise is that the 120mm has a narrower FOV vis-a-vis the 80mm OTA which is of course much wider ... anyway just a thought!
HTH
Cheers
Bill
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