I started with an LX-90 and now have the QSI583wsg, but moved to a refractor and equatorial mount first using a DSLR.
I'd recommend upgrading your mount and going for a refractor first. It's been said many times that the most important part of an astrophotography rig is your mount. I'm afraid the LX-90 just isn't up to it. The QSI also wouldn't swing through the forks, so you wouldn't be able to image anything closer to the pole than ~-70 DEC.
DT
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