Thread: Pentax XW eyepieces versus Naglers
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Old 18-09-2019, 02:23 PM
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Stonius (Markus)
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Quote:
Originally Posted by Don Pensack View Post
Markus,
The ability to accommodate field curvature diminishes with age. Older observers may not be able to accommodate the FC of certain focal lengths of the XW.

That's interesting - I wonder why that is?
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