Quote:
Originally Posted by Craig_
It looks like either a lack of a field flattener or a backspace issue if you do have one. Given the problem also seems more severe in some corners than others, this may also be compounded by some tilt in your image train.
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Hi Dave and Craig,
I used an 80ed f7 with qhy163M (4/3 sensor) and filter wheel - I used Ha,Oiii and G filters (the green filter was a visual one) and a 1X hercules field flattener ( I do not know what the back spacing is meant to be for this flattener). The apparent tilt may be due to the way I cropped the image.
Cheers Kanga