Quote:
Originally Posted by Startrek
Stephane
You already have a Bahtinov mask , the spider vanes on your newt !!
Just find a single bright star somewhere near ( as long as it’s above 30 deg Alt ) your intended object around magnitude 1.50 to 2.50 and take a series of 10 sec subs ( does the Nikon have a zoom function, that allows you to really get tight focus or use your capture software with a zoom box or zoom in feature ) each time adjusting your focus so that the diffraction spikes on the Star are like sharp swords
That’s how I’ve been focusing for years , never lets me down, I now use APT and the thumbnails are a 5 x zoom so I get a great close in view. Works just as well with my L Extreme filter
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Martin, wow I did not know that the diffraction spikes could be used for focusing
I can’t wait to try. Nina records the HFR of snapshots, but I find the recordings quite volatile & inconsistent. Sometimes a good old Bahtinov mask does the trick better! Or perhaps (more likely) I haven’t quite understood the measurements yet.
Thanks again for all your help,
Stéphane