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Looks like your on the right track Frank.....neally 4 minutes is excellant for that focal length.
Have you mentioned your processing yet...are you using flats,Darks and bias frame's for calibration...what software do you use...if you want a simple program to use that does it all...get Images PLus version 2.75...it will do all your calibration automaticly for you.....then just finish up in Photoshop.
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