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Originally Posted by DaveO
I had been repeatedly told that 8" was a minimum for astrophotography (admittedly this was by people selling me 10" newts!). I will need to investigate further.
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Absolute rubbish !
I would suggest 8" as a minimum size visual scope to be satisfying (especially for dso's) and I know many will disagree with that statement, but photography can be done with much smaller apertures, especially for widefield work.
For photography the most important factor is the stability and rigidity of the mount, and for larger scopes the costs can be prohibitive. Much better to comprimise on scope size than the mount.