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Hi Alan, The Skywatcher 150 Mak, which is the scope that I assume you
are thinking of upgrading to, is a very good scope. Why have you chosen
a Mak? They are really best suited to viewing planets, galaxies, and other small objects that require plenty of magnification. Having great focal
length, they are a bit "slow" photographically, and are only really suitable for photographing the aforementioned objects.
The occasional one suffers from image shift, so if possible, before handing over the money, look through the scope and move the focuser
backwards and forwards through the point of focus, and see if the image moves from side to side. A tiny bit of movement is acceptable.
raymo
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