Should I use a field flattener/corrector for my telescope?

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MacM545 Contributing Member • Posts: 776
Should I use a field flattener/corrector for my telescope?

How is it possible to know if I may need a field flattener/corrector for my telescope if using a focal reducer? What things should I factor, and is it (a field flattener) a good idea for visual?

BTW, my scope is a Meade 8 inch LX90 which is a Cassegrain and I've currently got an APS-C camera. Presumably, a full frame might need a corrector more than APS-C, and perhaps the only sure way is to try with a focal reducer first (without corrector). APS-C doesn't see as much towards the corners as does Full Frame because of the APS-C smaller FOV, but I might be trying to use my phone and a compact camera also (yes, I know the compact camera through the telescope is probably not the best idea).

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