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Ok. I have a 925, there is benefit in a good 2" diagonal, to get the best of low power, wide field 2" eyepieces you need the 2" diagonal. All the ones I have seen have a 1.25" adapter with them so you can still use the smaller format eyepieces.
If you buy a 2" diagonal, get a refractor type and a screw on adapter in place of the original visual back. The SCT diagonals screw straight on in place of the original visual back but are difficult to rotate when you want the eyepiece in a better spot.
Edited to add as the previous post was made while I was writing, a straight SCT one is a real pain for exactly the reasons above. When you want to move it you can't undo the screw thread, when you don't want it to it slips undone and suddenly the ep is facing down.
Last edited by The_bluester; 26-10-2014 at 10:07 AM.
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