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Ignore the comments about an 8" dob being cheaper - yes it is, and yes it is good.
But with an 8" SCT you can sit down behind it in a comfortable stool and view for hours, without having to stand up a lot of the time. Though you'll need a dew shield, and I have a 12 volt hair dryer and battery pack handy for when the dew shield fails.
And it's a nice 2000mm lens for your Sony A57 (I've got one of those too).
You'll want a wide angle 20mm eyepiece for it seeing the faint stuff easily (though I've just switched to a 19mm Flat field one). And at least a UHC filter for planetary nebula.
And initially a 32mm 1.25" plossl for low power. Though with a 2" diagonal, a 40mm wide angle, or even a cheap 30mm ultrawide angle makes for interesting viewing.
Have fun.
Renato
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