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The qhy10 is a big sensor for a fast newt, you need to make sure it is as close to the tube as you can. Even then I think you will find a very large secondary is needed to fully illuminate the chip. The Orion optics ag8 uses a 90 mm secondary from memory. Personally I think that smallish fast newts lose too much because increasing the secondary size effects the obstructed area far greater than larger fast newts.
And I use the smaller qhy9 for reference.
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