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The color correction of the M90 is very good (my one at least).. You will want a reducer/flattener for photography...
The P flat III works with the M90, I found the Flat II to be flatter, but this was me being VERY picky... the WO 0.8x reducer flattener is just another name for the aforementioned flatteners. Either of these will do.
With the reducer, the Megrez 90 becomes F/5.56, which is rather fast... gives a nice wide field of view...
The focuser on the newer ones (L version) is the 2.5" linear power focuser. Its a fair bit nicer than the previous versions, and the version seen on my Megrez 102..
I doubt you'd be unhappy with the M90, its a very capable scope, gives nice visual views, and is a slick astro imaging scope...
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