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Old 06-09-2014, 12:54 PM
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MortonH
Deprived of starlight

MortonH is offline
 
Join Date: Nov 2006
Location: Sydney
Posts: 3,775
The XF12mm has significant field curvature. In a small f/5 scope it will be nice on axis but stars near the edge are just a blur. And the curvature is noticeable from around 50% from the centre.

The XF8.5 is much better and is an excellent eyepiece.
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