Re: [APML] Meteor Photography Questions

[Stephen Pitt <lthuedk@pe.net>]

Hi Alson, have you considered Provia 400f pushed 2 or 3 stops?  Stephen Pitt

Alson Wong wrote:

> ----- Original Message -----
> From: "Jerry Lodriguss" <jml@astropix.com>
> To: <astro-photo@seds.org>
> Sent: Wednesday, October 31, 2001 12:01 AM
> Subject: Re: [APML] Meteor Photography Questions
>
> > Alson,
> >
> > Shoot wide open!  If you want meteors, that's the only way to go.
> >
> > You simply can NOT make up for the reduced aperture and reduced ability to
> > record faint meteors by exposing for a much longer time before reaching
> skyfog.
> >
> > You have two separate exposures going on here at the same time, the meteor
> > and the sky background. The meteor exposure is essentially a flash
> exposure
> > that will be governed strictly  by aperture and f/ratio and film speed.
> The
> > length of the exposure has nothing to do with recording an individual
> > meteor. You could shoot all night at f/16 based on your thinking, but you
> > probably wouldn't capture any.
> >
> > The only possible argument for long exposures is that you want to capture
> a
> > lot of meteors on one frame, but to do that you should be thinking of
> using
> > a film with a LOT of reciprocity failure, so you can still expose long,
> but
> > do it wide open.
>
> Yes, recording a lot of meteors on one frame was what I was thinking about
> with P1600, which, according to Robert's tests, has a two-stop loss in speed
> after two minutes.  At 1600, I can go 15 minutes at f/2.8 with my 28mm or
> 20mm lenses (which would be better, 28mm or 20mm?).  I know that my best
> chance for recording the faintest meteors is to use the 50mm wide open at
> f/1.8 (4 minutes), but shooting at f/2.8 would make it more convenient in
> that I could start and stop the exposures on both cameras at the same time.
> I may try some exposures at both f-ratios.
> --
> Alson Wong
> Riverside Astronomical Society
>      http://www.rivastro.org/
> Visit my Web page at:
>      http://home.earthlink.net/~alsonwong/index.htm
>
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