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(meteorobs) Re: film.



What is the high speed tungsten film that you use???  Bob


>From: "C.L. Hall" <chall@cyberusdot ca>
>Reply-To: meteorobs@atmob.org
>To: Meteorobs Net <meteorobs@atmob.org>
>CC: OAOG Net <oaog@eGroups.com>
>Subject: (meteorobs) OT.. Comet Linear under full moon!
>Date: Fri, 06 Jul 2001 07:56:50 -0400
>
>Greetings all,
>
>Good mornin'!
>
>Just a brief note as I am waking up to go to work...  Saw Comet LINEAR,
>C/2001 A2 last night, actually about 1.30 this morning, for the first time!
>
>Head of Pisces was still low, and the comet had just cleared the trees out
>front.  Once I found the head of Pisces in my 7x35 binoculars, the comet
>stood out very easily with averted vision.  No estimate on mag... although,
>actually... I should get out my AAVSO atlas with mags on it, and do the out
>of focus star trick, that would work.  Although... if I go out of focus
>much, I may lose comet visibility under the full moon.  My (very rough)
>impression is that it looked about as bright as M31 in binoculars under the
>full moon, and about the same size, but a bit fatter and not as
>elongated.  LINEAR was lower, though, in the sky than M31.
>
>Took some photos from my window ledge, using my high speed tungsten film
>again.  That tends to cut through both light pollution and moonlight pretty
>good.  Did the usual 30 sec up to 60 sec shots, and one 2 min just for the
>heck of it.  Usually with normal lens, the 35 sec shots are the best, with
>the 45 sec shots showing the best tail for comets, using just basic camera,
>55mm lens, and tripod.  That's the common setup I have used for all my
>other comet photographs over the years... makes a nice scale
>comparison.  Films have varied over the years though.  (Have also done
>guided photos of more recent comets, but have kept up the basic camera and
>tripod shots for comparison with my earlier photos.)
>
>Anyway... it must be decent brightness to pick up so easily with small
>binos under full moon!  I have a decent country sky, so that does help, so
>you should (in spite of the moon) still try to get out of the city to see
>the comet, to minimize your light pollution.
>
>LINEAR is well worth a look though - it's actually a very nice little 
>comet!
>
>- Cathy Hall
>   south of Ottawa, Canada
>
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