Quote:
Originally Posted by gregbradley
Greg - the back focus specs of the TCC are +/- 2.5mm. I’m within 0.5mm of the recommended figure, depending where the tilt corrector is within its range of movement. Analysis of tilt in ASTAP shows a definite skew towards the top right corner - it’s definitely visible at full resolution. I’ll be disappointed if it doesn’t resolve with adjustment of the tilt corrector.
DT
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The +/- 2.5mm is for the flattener. The TCC is +/- 1mm.
https://www.astro-physics.com/quadtcc-ap130
https://www.astro-physics.com/13035ff
You most likely have both issues to some degree. Roland has an article (I'd have to look for it on their site) about spacing for the correctors. But the intro is interesting as basically he says that there can be minor variations between scope's lenses. So with +/- 1mm as a tolerance there is a chance a particular scope may need a slightly different spacing. Something to know if things are not round after correcting for tilt. You could make some spacers with your 3D printer.
Greg.[/QUOTE]
You are correct on the specs - my apologies.
I'll try correcting tilt first, then worry about spacing.
DT