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Focusing the Newt
Thanks Martin! Yes I will need to buy a couple of 1mm spacers and experiment a little. Do you know where I can order some? Can’t seem to find anything under 3mm. Really not an issue at this stage, but would be nice to fix some day. I also need to get a Bahtinov mask rather than “guess” perfect focus.
Clear skies,
Stéphane
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
I do check my focus again sometimes during the session if I see the stars are bloating a tad
I’ve never used an auto focuser and probably never will
As I said it’s never let me down
When I used my Canon 600D , I used the same method and BYEOS had a nifty zoom box so it worked really well
My focusing time would be 5 to 6 mins , the more times you do it the easier it becomes
Leave it to you if you want to use a mask
Cheers
Martin
PS I bought my spacers from Bintel but I’m sure there’s other suppliers around
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