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Dazzler,
Someone mentioned previously that "some" of the pentax XW's suffer from field curvature, in "some" telescopes.
The two eyepieces affected here are the 14mm and the 20mm, with the 20mm being a bit worse than the 14mm. It is not an issue with any of the other focal lengths.
That having been said, it is also only an issue with "some" telescopes, notably short focal length newtonians. I use both in my 18"/F4.5 Obsession which has a 2.1 metre focal length and they perform very well. Similarly, I think they would do very well in your 10"/F10 Catadioptic scope with it's 2.5 metre focal length, but you can't be sure. As Rob suggests, you should try before you buy. Outside of the field curvature in "some" scopes the 14mm and 20mm XW's are superb. They exceed everything else available in terms of contrast, sharpness and light throughput. The other focal length Pentax XW's, have no issues in any way, they are superb.
CS-John B
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