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I have been using the 290MM mini for a couple of years and they (I have two) have performed very well either coupled up to guidescopes (A 72mmm Evostar) or in an OAG at focal lengths from about 300 to 2300mm. At 2300 (Celestron C925 at it's native F10) I binned it 2X2.
As far as I know there is no functional difference between the MM and the MM mini, just the mini is easier to package for use with an OAG.
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