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The AP .67 reducer is a variable reducer depending on the distance between the reducer and the CCD. It is not a flattener. Longer distance = more reduction and smaller illuminated circle.
It has an external diameter of 2 inches, so it slides inside the focuser.
Have a read of the PDF of the AP website about calculating the image circle and reduction depending on the reducer to CCD distance. I had a custom adapter machined by precise parts and the calculated reduction was spot on. It will provide an imaging circle of sufficient size to illuminate your 8300 chip.
DT
Last edited by DavidTrap; 28-01-2013 at 08:37 PM.
Reason: added a bit
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