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Some advice please on what is going on with flats
Hi there, I think I have an issue with my optical train somewhere. I have been imaging Eta Carina for a few nights and the subs I am getting have looked okay. I went to get some flats after the session the other night and this is what they look like more or less the same for every one of my 7 filters.
Does anyone know what the dark area in the bottom left is all about?
I have a ZWO 7 position filter wheel and a 1600pro MM camera if that helps. I have never seen a flat like this before but I don't think I have done flats before before with this camera. Scope is a FSQ106 with Orion OAG.
cheers
Brett
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