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Re: [OM] long exposure vibration question and misc.

Subject: Re: [OM] long exposure vibration question and misc.
From: Roger Wesson <roger@xxxxxxxxxxxxxxxxxxxxxxx>
Date: Thu, 23 Aug 2001 11:41:22 +0100
Michael Zimmet wrote:
> 
> My camera's an OM-1n.
> 
> I'm going to be taking some waterfall photos next week. Many of them
> will involve shutter speeds of 1/15 sec. - 1 sec. The camera will, of
> course, be mounted on a tripod for such pictures.
> 
> Ideally, I guess I should focus/compose/meter, then lock up the
> mirror, then trip the shutter with a cable release. (Right?)
> 

I think it really depends how critical you will be of the results.  I've
done quite a lot of waterfalls at slow shutter speeds myself, and most
of the time I do one shot with the mirror locked up and one without. 
I've never been able to tell the difference.  However, this is with
wide-angle lenses - with a long lens, it might be an idea.  Also depends
how firm your tripod is I suppose.

> Or if I'm
> wearing gloves (not that I'll be wearing gloves next week, but I might
> wear gloves when photographing in winter -- and I do sometimes choose
> to photograph waterfalls in winter) it can be somewhat tricky to twist
> the little mirror lock up thingie on the camera.

Solution - wait until the waterfalls are actually frozen, then there's
no need to do long exposures.  Sorted!

> Anyway, it's my understanding that shutter speeds of around 1/15 sec -
> 1 sec are where the effects of mirror slap are most pronounced. So I
> was wondering whether the OM-1n has a reputation for being a
> relatively low vibration camera (where neglecting to lock up the
> mirror is probably something I could get away with once in a while)? 

There was some talk about this recently, I think.  Main trouble is that
you can't pre-fire the aperture, and this can be a source of vibrations
as well.  I think that's right anyway - someone'll say if I'm wrong, no
doubt.

Finally about print film - I haven't heard of any print film slower than
100 speed, and I don't think it exists, at least in any kind of easy to
get hold of sort of way.  D'you not want to use slides?  I shot my first
ever roll of Velvia the other week, and also a roll of Agfa RSX II 50
speed, and I may possibly be a convert to the slower speed.

Hope that helps,
Roger

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