Re: [APML] The Kolb Fireball?

["Chris & Jennifer Cook" <ccjd@ix.netcom.com>]

Hi Jon -

>Nice shot, Chris!  The clouds really add an interesting feel to the image.
>It could be the same one I shot, although the smoke train looks a little
>different.  I guess the perspective on that would be different from your
>site as well.  Let's see, we were maybe 1500 miles apart, the meteor I shot
>in Auriga was nearly overhead and what, 50 miles up (anyone know what
>altitude these things tend to burn up at on average?), so yeah, you should
>have a noticeably different perspective than I did.  What time was it when
>you caught this one?


Thanks!
Yeh, the clouds sort of add a sense of depth to the images.  Although
visually, we could have done without them.
I don't know the exact time I took it but I'm going to guess between
2:30 -3am...


>More nice shots - the clouds add a really cool effect!  It looks like you
>had to do some surgery on the 20mm f/2.8 shots.

I cropped the Orion 20mm shot about 25%.  You can see that Sirius is a
football...  Normally, I would stop it down to f/4 or f/5.6 but I figured
the slower f/ratio would loose any faint meteors.


>I was shooting the 20mm
>f/2.8 AF-D Nikkor, and there are pteradons, not seagulls, in the corners.
>It makes me wonder if there's much point to using such wide lenses on
>tracked shots for meteors next time.  When they're wide open, the usable
>image area is so small, it might be just as well to shoot a faster 50mm
lens
>stopped down to f/2.8.

You're probably right,  you can doctor the bright stars but this can get
quite labor intensive on a deep exposure.

Chris

==================
Chris Cook
Astronomical Photography
www.abmedia.com/astro



--  APML Archives at <http://astro.umsystem.edu/apml/>  ---
             Unsubscribe at <majordomo@seds.org>