Hi Peter,
Thanks. I think you should be able to get pretty good results. Refactors are sharper in general, but you might need to use newer generation CMOS cameras with smaller pixels. I imaged this target a few year ago with Skywatcher Quattro 10/F4 at 1000mm with an ASI1600mm. My main problem back then was guiding accuracy plus my inexperience with a Newtonian. Since multi-star guiding became available, guiding accuracy of my CEM60 was elevated to levels close to premium mounts. Image scale for focal length of 1000 mm on popular cameras with 3.8 micron such as ASI533/1600/2600 is about 0.8 arcsec/pixel. Calm aussie skies can definitely resolve finer than that, as seen in so many great images in forum. With better sharpness of your scope, you should be able to get great results. I own a Canon 400mm/F2.8 which, with extenders, definitely showed smaller stars than Quattro 10.
Cheers,
John
Quote:
Originally Posted by PRejto
Nice effort, John. You have made me want to attempt this taget, but I suspect with 140mm I won't be very successful!
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