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Old 20-07-2016, 08:59 AM
Roger273 (Roger)
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TOA150 image train

Hi
I am setting up a TOA-150 for imaging and need some advice on the order of things. Using the TOA-67 flattener and a FLI focuser (either Atlas or PDF) should the focuser come before the flattener or after? Before looks a better option but probably means more adapters. After looks simpler but uses up some of the flattener back focus.
Any suggestions would be much appreciated.
Regards, Roger
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Old 20-07-2016, 09:05 AM
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Atmos (Colin)
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It should be OTA, FLI Focuser then flattener. Focusing is achieved by moving the whole focus, not the distance between flattener and CCD which should remain the same
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Old 20-07-2016, 08:25 PM
Roger273 (Roger)
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Hi Colin
Thanks for confirming that, it did appear like the most sensible option.
Regards, Roger
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