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Hi Martin,
There is nothing wrong with a 6" Newt for imaging, and I don't
think that they are underrated,[plenty of people use them] but there are several reasons why bigger is better. Because of those reasons many imagers go for the largest scope that their mount and/or budget will allow.
Firstly, and importantly for quality imaging, the larger the diameter of the
mirror/objective, the smaller the features it can resolve. This is particularly
obvious with lunar images; larger scopes show detail that smaller scope owners can only dream of.
Secondly, an 8" has approx. 80% more light gathering power than
a 6", and a 10" has just over 250% more than a 6". This means that
subs of the same length as taken with the 6" will produce[ especially in the case of the 10"] deeper more detailed images.
Thirdly, especially useful for planets and planetary nebulae, a larger scope
can handle higher magnifications.
raymo
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