[graham.hobart (Graham stevens)]

Hello all, these are the first attempts with my home modified 450D. I am Ok with the Eta one, but the M42 has these strange blobs on it. I used the same set up-camera, field flattener, scope etc. I took darks at almost the same temperature. I used new flats with the same set up. Only difference was I cleaned the objective on my refractor between the images but I would have though if it was smudges then they would have been compensated for in the calibration frames (I didn't do dark flats though).
Was a pretty bright Moon nearby in the M42 shots so maybe reflections. But those would be taken out with darks as well wouldn't they?
Help please,as beginning to regret taking screw driver to 450D!
Graham