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Subject: Re: [M]: Nagler 31mm was: OT: Dob comment
From: Andy Wallace
Reply To: mapug@shore.net
Date: Sun Dec 19 10:12:03 1999
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While you're here, how about checking out the
Astronomy Book
List ? |
John-
Thanks for the info--I've decided to keep the eyepiece and today am
going to cut the truss poles on my dob.
Andy
>
> In a message dated 12/18/99 10:00:36 AM Eastern Standard Time,
>
> << 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 >>
>
> Plenty of test I'm "familiar with" on the eyepiece involved experience
> observers and stars. It's just that none of those were by me personally.
>
> My only look through one in person was indeed indoors during the day, in the
> presence of Al Nagler himself at the public unveiling. I do agree with you
> that it's not a sufficient test, so that's why I didn't buy one that day
> despite the $10 discount or something like that, which Pocono was
> offering...and they weren't in stock either.
>
> But testing for color and off-axis sharpness using a small (probably smaller
> diameter tube than the eyepiece has, literally!!!), short-focus refractor
> also isn't a valid test. THAT's the point I was making, not that an
> astrophoto on the wall 8 feet away looking sharp would justify spending $595,
> or even $585 for that matter. My wallet agreed with you for the time being,
> but I'm sure one or more of my scopes will wind up being good enough with the
> eyepiece that Al's net worth will eventually include more of my own....again.
>
> I don't remember any other complaints about color fringing in the 31mm, and
> I've read hundreds of posts on s.a.a. on the eyepiece. The main complaints
> are: distortion made obvious by panning, just as with more conventional
> Naglers and Panoptics; and not being able to see the whole field at once,
> with claims of some "blackout radius" which I personally didn't notice at
> all. In fact, I thought I could view the whole field more easily than with
> other Naglers. The daytime test was better for this purpose than stars would
> have been.
>
> John
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