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I use an 8” f5 newt with focal length of 1000mm
With the right camera , good conditions , and some creative processing you can image fairly “deep” without going to the next step with long focal lengths , expensive mounts , expensive scopes etc... plus a requirement to guide a lot tighter than you would normal be comfortable with
Here’s some “Zoomed in images” of the outer arm of Carina nebula , Rosette nebula , Centaurus A Galaxy and Sombrero Galaxy showing a fair bit of detail and resolution at 1000mm focal length ( images were cropped a bit to “zoom in” close )
My imaging camera ZWOASI2600MC
Subs no longer than 3 minute
Nebula imaged with L Extreme filter under full moon
Galaxies imaged with no filter during New moon ( dark )
Hope this demonstrates what is achievable at 1000mm FL
Cheers
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