I have roughly polar aligned my scope and wanted to try and capture some pics of M42 using a 200mm Canon EF lens on a 500D piggybacked on the scope. There is some flaring of some of the larger stars but in different directions (outward from centre). However when I use my scope for prime-focus pics of M42, I don't see these. It seems to be some flaw in the lens optics which I didn't expect with this lens - any suggestions? Thx for any help.
http://i1255.photobucket.com/albums/...7/ORIONALL.jpg