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If there is a break in the clouds I will try my luck. Would you sugges a 100mm f2.8 or a 400mm f 5.4 ? I don’t have a tracking mount

Definitely 100mm f2.8. But to be honest I would go even wider without a tracking mount - maybe 24mm (full frame equivalent).

A tight crop from a 10 stack at 100mm. I really need a sky mount lol newtest22.jpg

That is great for a 100mm without guiding!