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All good Peter. Hope it helps.
I have found f6 and above that coma is less of an issue and more easier on eyepieces.
Most deep sky stuff looks better with lower magnification and look better with a wider field of view.
Yep , the larger aperture is to collect more light.
Each scope has their max magnification but I have never used it for my dobs.
I would still get a light shroud as it also acts as a dew shield for the primary mirror.
M11
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