fluX Posted January 6, 2017 Share Posted January 6, 2017 After a break of about 3 years I'm back in amateur AP. I have a new apochromatic refractor now, but I'm having a very curved field with comet like stars at the edges of the field. What I don't understand is why the curvature of the field is apparent not only at the edges, but up to quite close to the center as well. The aberration is worst at the edges though. It's a 130mm aperture, 910mm focal distance triplet with a FPL-53 ED element and 4 inch rotatable Crayford focuser. You can see all specs here:http://www.robtics.nl/product_info.php?cPath=21_23_259&products_id=1181 As it's an f7, I find the FOV too narrow as I'd mainly like to do DSO imaging. Can you recommend me a good reducer/flattener that will work well with this scope? I'd like a reducing factor of around 0.7x - 0.8x. I'm now imaging with a Canon DSLR, but I'm thinking of upgrading to a QHY-163M with filter wheel. Can you also tell me how I can connect this reducer/flattener to my focusser? Thanks in advance! Link to comment Share on other sites More sharing options...
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