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I've had this discussion with Luke (At Andrews) before, you want a 1.25 star diagonal not a correct image prism. Prisms are not for astronomy as a general rule. They do have a GSO right angle star type diag there....avoid prisms like the plague.
Mine has made a big difference over all, worth the cheap investment in my opinion.
BTW I also just recently replaced the cheap plastic focuser for a metal 2" one using a conversion kit I found on the net. I got mine from scopestuff.com. There are other vendors out there that sell them too. (my experience with scopestuff could have been better, had to chase them up with emails etc)
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