Re: (IAAC) Barnard's Loop, Naked Eye or Otherwise
From: "Penny Fischer " <email@example.com>
>I've seen what I thought was Barnards loop under low power in mediocre
skies. But try as I might, I could not even imagine nebulosity around
the Rosette Cluster.
To actually see the Rosette Nebula, try any very low-power field with an
O-III filter. Using this combination, it's visible in any scope from an
80mm (even binocs) on up. My 8" F/6 used to give a great
fill-up-your-field view at 37x (35mm eyepiece, 6mm exit pupil). An 8"
F/5 would have been even better, yielding a little more space around the
object and giving maximum contrast and exit pupil (7mm). I have to
admit, were it not for filters, I wouldn't see half the great nebulae up
>I saw my first views of the NA Nebula this week in my friends
Obsession, with what I think was an OIII filter, but that object is too
extended and we could only see a portion (Gulf of Mexico region) of it.
Still, I have to admit it was a grand object to view.
I think the Gulf region presents the highest contrast on the NA nebula
and the sharpest cutoff between nebula and blackness. If you get a
chance, try a Shorttube or Pronto at low power with an O-III.
Thanks for your excellent observations and discussion of the Pleiades
>From: Bruce Jensen <firstname.lastname@example.org>
>Date: Tuesday, September 22, 1998 3:06 PM
>Subject: (IAAC) Barnard's Loop, Naked Eye or Otherwise
>:From: Mel Bartels <email@example.com>
>:>I've never seen Barnard's Loop, but a few amateurs have
>:>reported this. Unaided eye observing is a lot of fun and very
>:rewarding - I encourage all to to try, and to spend time practicing
>:Some friends and I have seen Barnard's Loop using an H-Beta filter and
>:Pronto late last fall at Fremont Peak in California; it appeared as a
>:faint strand that could be traced several degrees along the eastern
>:of Orion. We did not try to see it naked eye or using a filter. I
>:occasionally tried this technique on such objects as the Rosette and
>:North America Nebulae - the NA is pretty easy in most dark skies, but
>:the Rosette has always stymied me with or without a filter.
>:When I look at the Pleiades naked eye or filtered, all I see is a
>:scattering of 6 or 7 stars (if I'm lucky) that are lopsided and blurry
>:astigmatism prevents high-definiton naked eye viewing. There are a
>:guys out here who routinely count more than a dozen stars, though, and
>:sometimes as high as 16 or even more. Some wear glasses and some do
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