Re: Review of TMB optical Monocentric eyepieces
From: Tom Trusock (ttrusock_at_yahoo.com)
Date: 06/25/04
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Date: Fri, 25 Jun 2004 16:26:09 GMT
On Fri, 25 Jun 2004 15:51:47 +0000 (UTC), brian@isi.edu (Brian Tung)
wrote:
>Tom T. wrote:
>> I was loaned a couple for review - No astigmatism in the ones I saw,
>> but they do have a curved field that becomes fairly noticable on fast
>> scopes.
>
>Since fast scopes often have significantly curved fields themselves, are
>you certain you are seeing the field curvature of the eyepiece, instead
>of the field curvature of the objective? After all, the field curvature
>of the eyepiece shouldn't change from telescope to telescope, it seems
>to me.
>
>Brian Tung <brian@isi.edu>
>The Astronomy Corner at http://astro.isi.edu/
> Unofficial C5+ Home Page at http://astro.isi.edu/c5plus/
> The PleiadAtlas Home Page at http://astro.isi.edu/pleiadatlas/
> My Own Personal FAQ (SAA) at http://astro.isi.edu/reference/faq.txt
I should probably add -
I tested them in a variety of scopes, both fast and slow. Two of the
faster scopes were a 15" f5 newt (with and without parcorr) and a
Genesis SDF (f5.4). IIRC, the field curvature was quite noticable in
both.
Tom T.
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