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I would suspect a 5" would come close to what I can get with the 6" but I'm not sure.
I can tell you straight out an achromatic refractor is not an easy thing to get good planet shots with. The main problem being getting natural colours, all to do with the design of the lens system a achromatic refractor has.
In all honesty I suggest getting a reflector or an apochromatic refractor for astrophotography!
I only received a special filter today to combat this colour problem, & I'm testing it right now to see what will happen, so I may alter my opinion on this shortly! (& I may not too!)
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