alacant Posted January 20, 2018 Share Posted January 20, 2018 Hi everyone. Focusing the imaging camera on Mirfak is good for checking OAG focus because there are loadsa stars around it. Waiting for m78 to get higher, I thought I'd have a go at this. It came out quite well for a time filler but I wonder why it has a flat top? Thanks for looking. 700d + nt150s 48 minutes ISO 800 Link to comment Share on other sites More sharing options...
Thalestris24 Posted January 20, 2018 Share Posted January 20, 2018 Possibly cut off by focus tube intrusion? Louise Link to comment Share on other sites More sharing options...
Pete Presland Posted January 21, 2018 Share Posted January 21, 2018 that has come out very well, some lovely star colour showing there. Link to comment Share on other sites More sharing options...
alacant Posted January 21, 2018 Author Share Posted January 21, 2018 11 hours ago, Thalestris24 said: focus tube intrusion? Yeah, forgot about that. OTOH, it doesn't appear on the star test. Dunno. Does this look like enough intrusion? TIA. Link to comment Share on other sites More sharing options...
Thalestris24 Posted January 21, 2018 Share Posted January 21, 2018 4 hours ago, alacant said: Yeah, forgot about that. OTOH, it doesn't appear on the star test. Dunno. Does this look like enough intrusion? TIA. Hi Um, not sure. I'm out of touch with newtonian scopes... Maybe try again on another bright star? Louise Link to comment Share on other sites More sharing options...
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