I can spot the Sombrero in my 11X70 binos from my home in Sydney. An 8" dob is not a problem & I've also seen it through an 8" dob from home.. BUT, it is not a large object, so can be difficult to identify. As Ron says, a good chart is a must, be it paper or digital. At low magnification it appears as a short, thin streak of faint nebulous light. Highrr magnification will reveal its more recognizable features.
Take your time. It is a devil of a target to nail, just challenging.
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