Quote:
Originally Posted by Peter.M
I would have thought that this effect would only be justifiable with narrowband filters as with broadband colour the wavelength shift is such a tiny fraction of the light allowed to pass through the filter.
If curvature was measured by brightness then putting a star cluster off axis would manifest itself as curvature. (I don't know if this would happen but I assume it dosn't)
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They are all multi-layer filters....interestingly the H-alpha has the most layers and throws up the odd result....and smaller stars....
Yes, putting a star cluster off axis shows up as curvature in CCDI. (trial copies are available as free downloads....good fun to play with)