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Forum: Photographic Technique
06-08-2018, 07:03 PM
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The wider the angle, the smaller will the stars look in your photo. Depends on what you are looking to shoot, ultra wide angle lenses may be good for astro landscapes in which you see the milky way and some of the brighter stars, but not so much to take pictures of constellations etc.
Stacking seems to be the way to go regardless of your equipment. Either to lower noise, or to capture different shades of faint deep space objects, many of the best photos I see taken with normal camera gear (not motorized trackers and telescopes) are stacked.
To answer your question: In my experience with single photos with astro tracer, f2.8 is perfectly fine, f4 means more noise but I still find it acceptable. Coma is a greater issue because that's not fixable via stacking.
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