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I got the Lumicon 2 inch. I figured it would make it easier to get the field flattener in there, being 2 inch. So far, even though I haven't quite got it working yet, I am happy with it. I was expecting there to be more light loss through to the camera (the imaging camera, not the guider). But that doesn't seem to be the case.
I hadn't thought of an extension. I suppose I could use any appropriate tube and experiment with the length.
The other issue that has surprised me a little is just how far out of focus it is when I put the oag in my 8inch newtonian. My cameras come to focus quite easily with no mods. I have a DMK21 and an EOS400. Its no big issue - I didn't buy it with this in mind.
Darrell
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