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Originally Posted by janoskiss
The 17mm T4 is plenty sharp as far as I can tell.  Though I have not critically evaluated it (however that's done). One of these days I will compare it with my 17mm TV plossl... |
Its funny it goes. The eyepiece seems fine until you drop another in the focuser that trounces it.
When I was observing with Dave47 one night and I looked through his 12nagt4, then we substituted a barlowed 22mm panoptic and there was a
big difference in sharpness
in favour of the panoptic.