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Thanks all for the helpful responses. I did mean the SW102, with the 500mm focal length.
I will take some time to test the telescope straight through and see how much of a difference that makes.
The other thing I notice, is that Andrews has 2 inch diagonals that range from $50 (non name brand) to $300 (WO) with GSO just on the cheaper end of the midway point. GSO seems to sell a plain bk7 diagonal, a bk7 dielectric and a quartz one. Assuming you largely get what you pay for, and given that the bk7 is half he price of the dielectric one, what is the extra money paying for (it doesn't look like much more than brand with the WO diagonals, as they are only 1/10 wave compared to th 1/12 wave GSO ones).
I realise these are often subjectiv distinctions, but it is not easy for me to get out to an Astro club to see for myself, so is there something I am missing?
Thanks again,
Matthew
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