Blue Filter Issue
My first attempt to use new Astronomik filters.....
The R and G mean stacks look totally normal (ca 80 x 5 min subs).
The blue looks terrible and when highly stretched shows what looks like 4 off-centre large overlapping circles. The blue flat doesn't show the circles. Just in case it was the flat I stacked without using the flat and got the same result.
My setup for this did not include the usual ONAG. It was TEC140/SX FW/Trius.
Any ideas?
Thanks!
Peter
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