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Looks like there's multiple issues at play here. I think I have the flattener spacing sorted now, but there's still (sometimes) large shifts in FWHM over the image. The magnitude of those shifts are not the same from image to image so I don't think it's tilt. Off the top of my head, one of the best subs from last night was 2 - 2.4, whilst a randomly selected rejected sub was 2.4 - 3.6
I assume this is what field rotation could look like (if it was consistent), as it kinda looks like some fixed point off the side of the image is sharp, but the further you get away from it the worse it gets.
Everything appears tight and I'm using an OAG. Still having some issues with the mount in RA... had been hoping it was just seeing, but I think I need to drop Avalon a line.
I'll go through the PHD log and check what the guiding looks like on the better subs vs the bad ones, might shed some light...
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