Best DSLR or ILC for Night Sky Imaging?

Started Nov 8, 2017 | Questions thread
kiwi2 Veteran Member • Posts: 4,405
Re: If you want the best, a dedicated cooled CCD cameras are far better than all the DSLRs and ILCs

1llusive wrote:

As aperture increases on telescopes, we see more detail.


Yes larger apertures on telescopes usually also come with longer focal lengths so you get more magnification and more resolution. Less diffraction due to a greater area of light relative to the edge.

For visual observing, it still also comes back down to f-ratio to how bright a telescope is for diffuse objects like nebulas and galaxies. A bigger telescope just gives you more magnification for the same brightness relative to its f-ratio. Which is why you get to see more detail in small dim galaxies with the bigger telescope you have.

But visual observers of such deep space objects wouldn't want to use a large f/16 refractor that was built for planetary observation. Deep space subjects would appear too dim in it.

They would rather use big newtonians between f/4 to f/5 like these...

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