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Thanks again for the rely.
I can see what you are referring to and just went and did another measurement just to be 100% sure.
I am 80.5mm, so basically 2mm too long.
I think i can find some adaptors to make up a 18mm M42 -M42 spacer.
Or some adaptors to make up a M48 13mm spacer
This would be in place of the 21mm M42 - M42 spacer.
It would give a distance of 77.5mm, I would then just add a 0.55 tin shim to bring it to 78mm
So that 55mm back focus on the ZWO site in regards to the asi2600mc doesn't really effect or mean too much in this setup then?
I think that sounds about right?
Last edited by bluesilver; 15-11-2021 at 12:53 PM.
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