Re: [APML] Petzval hot spot?

["Philipp Salzgeber" <philipp@salzgeber.at>]

and I always wondered why Televue offers a Petzval-Design telescope with
about the same aperture and f/stop in the same price range like the DED and
FSQ but without the medium-format option. In my eyes this speaks for
Televue.

It seems I need to learn much more about refractor optics, because now I am
wondering what makes a Petzval design more attractive to the manufacturer
than a Triplet with a field-flattener...

with best regards,

Philipp Salzgeber


-----Ursprüngliche Nachricht-----
Von: <Chris1011@aol.com>
An: <astro-photo@seds.org>
Gesendet: Mittwoch, 18. September 2002 18:42
Betreff: Re: [APML] Petzval hot spot?


> In a message dated 9/18/2002 10:51:15 AM Central Daylight Time,
> philipp@salzgeber.at writes:
>
>
> > how did Uncle Al solve the problem?
> >
> >
>
> He didn't. Unc Al cannot sidestep the laws of physics - especially the one
> where light travels in straight lines. The fact that nobody has said
anything
> about this shows you how much people notice things.
>
> Roland Christen
>


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