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From: ems@amdahl.UUCP (ems)
Newsgroups: net.space
Subject: Re: Photographing Halley's with your kids
Message-ID: <2612@amdahl.UUCP>
Date: Mon, 20-Jan-86 14:54:54 EST
Article-I.D.: amdahl.2612
Posted: Mon Jan 20 14:54:54 1986
Date-Received: Tue, 21-Jan-86 09:00:31 EST
References: <8601180216.AA23509@s1-b.arpa>
Organization: Circle C Shellfish Ranch, Shores-of-the-Pacific, Ca
Lines: 34
Summary: Some additional suggestions

In article <8601180216.AA23509@s1-b.arpa>, Dave-Platt%LADC@CISL-SERVICE-MULTICS.ARPA (Dave Platt) writes:
> Well, here's some information I've gleaned from a number of photo and
> astronomy magazines on this general subject... I'm working from memory,
> so the figures etc. will be pretty inexact.
...
> I'd suggest using an ASA 1600 slide film... slide film will work better

A few years ago at school, some of us were doing a project
involving comet photography.  The standard film used was high
speed Ektachrome pushed to about 6400.  Does anyone still do this?
The extra speed of a high ASA/ISO film should be a good trade off
of grain vs. blur from no motorized mount.

...
> To shoot the comet:  mount the camera firmly on a tripod (in a location
> shielded from the wind, if possible, and from any electrical lighting).
> Set the lens to the wide-open setting (f/1.8 or f/1.4, depending on
> which Canon lens you have), and set the exposure to "B".

You might also look up a friend with a f/1.2 lens.  I have one.  It
does an OK job.  Not the sharpest thing in the world, but blur and
grain will be bigger factors in this scenario...

> comet in the viewfinder;  then, cover the viewfinder opening with a
> small piece of black electrical tape (to keep out stray light during
> the long exposure).  Use the shutter release cable to open the shutter,

Or buy a viewfinder cover.  My cannon has grooves on each side of the
viewfinder to accept one.  They are cheap and nice to have.

-- 
E. Michael Smith  ...!{hplabs,ihnp4,amd,nsc}!amdahl!ems

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