Re: Another OA Reflector
From: Alan French (adfrenchremoveallthis_at_nycap.rr.com)
Date: 10/09/04
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Date: Sat, 09 Oct 2004 15:31:46 GMT
"Uncle Bob" <realonespam@bogusnet.net> wrote in message
news:416600b5$2_3@news2.uncensored-news.com...
> Alan French wrote:
> > We just got a new Orion catalog, and they now offer a 91mm OA Newt.
> >
> > Clear skies, Alan
>
> I made an off axis mask for my 18" just under 8". Nice images.
> It really makes it possible to explore the moon with a big dob.
> It cost 4.00 in materials, not including the layout compass.
> Tap Plastics had a Kydex-like offering that was suitable.
> Skies, dudes.
Uncle Bob,
I haven't done this experiment with the Moon, but one year I made a 6" mask
for my wife's 14.5" f/6 equatorial Newt and spent a couple of night viewing
Saturn and Jupiter with and without the mask. With the mask I found the
views often looked a bit "nicer," but I could never see more with the mask
than I could at full aperture. There were often moments to minutes where it
was steady enough to take some advantage of the extra aperture (although it
was always certainly seeing limited). I also appreciated the larger exit
pupil with the full aperture, and the brighter image provided a more
colorful view. The mask went in the wastebasket.
It certainly is a cheap and easy experiment to do, and no one has to rely on
someone else to decide if a mask is going to be useful in their observing.
Clear skies, Alan
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