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Re: [OM] exposure for star photos

Subject: Re: [OM] exposure for star photos
From: Christopher Biggs <chris@xxxxxxxxxxxxxx>
Date: 02 Sep 1999 15:23:26 +1000
Acer Victoria <siddim01@xxxxxxxxxxxxxxx> moved upon the face of the 'Net and 
spake thusly:

> I never remember to get something from the library. So, anyone know what
> shutter/aperture settings to use to capture constellations or just
> the> night sky? I'm currently loaded with my last or second to last roll 
> of Superia 400 (after that, I'm going E6). The night skies are getting

Stars are a point source---f/stop is irrelevant (you will be
assimilated)---all that matters is physical diameter of the aperture.
(Paging Michael Covington).

Do you wont trails or points?  For points you have to keep the
exposure fairly short.  Using a 45mm lens, I got slight trails from
10s upward.   Longer lens would trail sooner.

Using same 45mm lens, f/8 and 100ISO Ektachrome, 10s produced
wonderful colours and barely noticeable trailing.

> (1.4MC 1.8MC 3.5MC macro) and the 200/4. I'm thinking of starting with the
> 1.8. 30seconds sound OK for wide-open 50/1.8?

Expect trails around 1-2cm long on a 10x15cm print if you expose for 30sec.

Anything from 2 seconds to 6 hours will do.  You will have to LART the
lab beforehand or they'll say "there was no image on your negs".

cjb
-- 
 Christopher J Biggs \ chris@xxxxxxxxxxxxxx \ Vice-Pope Torture & Indulgences
 Stallion Technologies\ Brisbane,  Australia \   Holy Church of Givashitology
 nordfordfnrdfnodfnorfnordnordfordfnrdfnodfnorfnordnordfordfnrdfnodfnorfnordn

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