Doug, here is a table that might help. Otherwise Peter Zelinka on You Tube explains the formula in his video choosing your first dedicated astronomy camera.

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Thank you all for your help, I will try switch guiding from my guide scope (162 mm) to my imaging scope (480) and see if guiding improves next time I have clear skies. That will give my a pixel scale

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Hey Doug, The formula is:pixel size (microns) x 206.3 /focal length in mm = image scale in arcsec/pixel 206.3 results out of:3.6 * (180 degrees / pi) = 3600/1000 * (180 degrees / pi) = 206.26 Doug Doo

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Jerry, Where does the 206.3 in your formula come from, and what are its units? Doug

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Hi Walter, Yes, I would suggest a 2x Barlow or tele-extender instead of a 3x. The formula for pixel or plate scale is: Pixel Scale = (Pixel Size x 206.3) / FL, So for your combination: Pixel Scale = (

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Hi Doug, That would work if you get get the camera to the focus position with the Barlow or tele-extender. I would suggest trying it at 2x instead of 3x.

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Hi Jerry, Thanks for looking at the logs. I went for the Orion guiding package because of its popularity. I thought it would be more than enough to guide my ED 80 at a 2 arc-sec/pixel imaging scale, b

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Hi Jerry and Walter, Would it be possible to use a 3X Barlow in the guiding scope to increase the guiding to the 2 to3 arc-seconds you suggest? Doug Doonan

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Hi Walter, I am just starting to look at your guide log, but I did notice that your guide camera (an Orion Starshoot Autoguider) with a 5.8 um pixel coupled with your very short focal length guide sco

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Hi Everyone, I am pretty new to the hobby, jus went out a few times with my EXOS2-GT PMC-eight. My first struggle with this mount was a ~ 3-4" wiggling in RA I could not get rid of. RA basically kept

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Parag Nice image! My guess is APT stopped at meridian. Look into that. Wes

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My first DSO with iEXOS-100 and just a DSLR unguided. Stack of 55 images 60 sec at 500 ISO and f/8. Very happy with this little mount! Thank you for this forum members for providing guidance to a tota

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Thanks Ian !! I will try out your tips on this image, and will re-post once done !! Thanks for the help !!

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Thanks Wes !! I was using my AT80ED with 560 FL and a 0.80 field flattener/focal reducer, so it should work out to 448 FL. I had to over expose Jupiter a little to get the Galilean Moons & Saturn's ri

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Dear Derril, this image shows the outer parts of the nebula far better that any I have taken (very well done) but, as you rightly say, the central part of the nebula is over exposed so that the trapez

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Ohhhhh. Nice. What focal length? Nice

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Hey Guys, Here is my shot of the Jupiter Saturn conjunction, 1 minute video, 1541 frames, with ZWO ASI120mc-s camera

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T Get Outlook for Android

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Yes Tim that fixed that

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