John--

The tests you are familiar with were done on a photo???? Something a
little more rigorous might be in order don't you think for a $600
eyepiece?? :)

Andy

>
> In a message dated 12/17/99 1:29:10 PM Eastern Standard Time,
>
> << I agree in part to needing good eyepieces for your telescope but I have a
> different slant on the new TV Nagler 31mm. I've looked through several
> 31mm and using the 85mm TV scope, found color fringing to be bothersome. >>
>
> The TV85 is a fairly short refractor, only 600mm focal length. Maybe it just
> has too much field curvature, and the color could have been due to the edges
> of the scope's spherical focal surface not being in the focal plane at the
> edge of the very wide field of the 31mm N5. In refractors like the TV85,
> you might very well get color in out-of-focus stars. Maybe even a little bit
> in in-focus ones off-axis! It could be the eyepiece, but I'd guess it was
> more the scope. In a flat-field TV101 things looked awfully good to me, but
> I'm talking about "stars" on a nearby astrophoto at TeleVue day at Pocono.
>
> Anyone detected color problems with the 31mm in a reflector?
>
> John

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