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Thanks for all your help Luka, I get what you mean now, I was thinking more about the thickness of the filter mount and not that the light refracting through the glass would focus further from the sensor and thus would require a 1mm spacer to correct the difference. I'll be thinking of ways to put the filter before the flattener but in the meantime I'll just concentrate on shooting smaller objects when using the filter the way it is for now. I can then just crop the bad star shapes out of the picture and no one will ever know! I have a modded camera anyway, so any shots of larger objects, or if I want nice stars to the edges, I just won't use a filter. There is so much to learn with this hobby.
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