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Download the free ccd calculator by Ron Wodaski. Its very handy for seeing what the field of view will be with different telescope/camera combos including reducers, barlows etc.
The Tak 1.6Q extender is a nice piece of gear which I have used to image a galaxy with a TEC180 and KAF8300 chipped FLI Microline 8300.
It takes longer but does work.
Reducers can be tricky as they often give coma in the corners.
Greg.
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