I know that I keep banging on about the benefits of simple and cheap imaging but it IS a fact. For example, September “Sky at Night” says “- – – If you fancy a challenge, have a go at using a 250mm or larger instrument and a magnification of 250X and see if you can spot Neptune’s largest moon ,Triton. At mag 13.5 it requires good dark skies – – – -“.
Here is an image I got from from the light-polluted Midlands with the 8” SCT and PD a few years ago:
Say no more!