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[OM] Re: Playing with night photography and my new scanner...

Subject: [OM] Re: Playing with night photography and my new scanner...
From: "Wayne Harridge" <wayneharridge@xxxxxxxxxxxxxxx>
Date: Sun, 6 Jan 2008 19:38:35 +1100
> 
> Looks good to me but I'm surprised at the apparent vignetting 
> at f/8. But maybe it's not vignetting.  Was it snowing at the 
> time of the shot?
> 

I've noticed the same effect with long night exposures.  I think it's a
result of reciprocity failure - in a shot where there is plenty of light
with reasonable exposure times you will only just notice 1/5 stop fall off
at the edge of the frame, however when you combine this with reciprocity
failure in a long exposure that 1/2 stop under might end up as effectively 1
1/2 stops under.

...Wayne



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