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in my limited experience the Canon L lens is the best and the wider the aperture the better.
Any difference with IQ using the zoom lenses. Say a 70-200 f2.8 IS at say 200mm f2.8 and with IS on instead of the 200mm at f 2.8. zoom creep is controlled using the rubber band on the lense body.
BTW is AF sufficiently accurate otherwise how to focus.
So sorry if too many questions. A newbie here experience limited to unguided short exposures. Learning how to stack pictures and looking for which GEM to buy.
cheers
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