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Originally Posted by jps
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Now I'm considering the 90mm for $300 from aoe. Bargain, but will it do the job. I'm thinking yes. All I need is performance on bright stars because my Newtonian does a very satisfying job on everything else including faint doubles. I guess when you have a really bright star with a faint close double I might still have a problem.
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G,day jps,
A 90mm Refractor will do a fine job on doubles providing it has a descent focal length/ ratio. When I am viewing doubles I prefer to use my refractor for several reasons including it's better contrast(compared to a fast Newtonian) and better relative performance in poor seeing/ turbulant conditions.