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Just a little update to this thread, I finally got a chance to try out the Pentax XF 8.5 and 12mm eyepieces this evening and as expected they are incredibly sharp. I compared them to the LVW 8 and 13mm in both the FS60CB and the TSA120.
I found the XFs are very sharp on axis and more neutral in tone. The LVWs have a warmer tone especially at the edge of field but the difference was minimal. On the trap stars in M42 the XF8.5 was better than the 8LVW.
The 8.5mm is the better of the 2 XFs being sharp across the full view, the 12 shows noticeable curvature in the FS60CB, less so in the TSA120. The LVWs are like the XF8.5, sharp from edge to edge.
I certainly would not rush into selling any of my LVWs but if there were more of these compact little XFs about I would love to build a set for the FS60.
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