Archived posting to the Leica Users Group, 2010/10/30

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Subject: [Leica] IMG: Roofers at 2500 ISO
From: hlritter at bex.net (Howard Ritter)
Date: Sat, 30 Oct 2010 22:32:57 -0400
References: <AANLkTimLBd+r-paAxBmfyGqeUM2oNdVqoQCfX71z+11o@mail.gmail.com> <c2f43104afef294b0c518967627b5f64.squirrel@emailmg.globat.com>

Alastair?

In answer to your question about the low noise level in bright-light 
exposures at ISO 2500, here's my suspicion: The amount of noise in a given 
exposure depends on a number of variables, one of which is the duration of 
the exposure. Perhaps at ISO 2500, 1/1000th at f/4 means noticeably less 
noise than 1/60th at f/16, despite the fact that the number of photons is 
the same in both cases.

I'll do a comparison and post it.

?howard


Replies: Reply from afirkin at afirkin.com (afirkin at afirkin.com) ([Leica] Noise)
Reply from jbm at jbm.org (Jeff Moore) ([Leica] IMG: Roofers at 2500 ISO)
In reply to: Message from images at comporium.net (Tina Manley) ([Leica] IMG: Roofers at 2500 ISO)
Message from afirkin at afirkin.com (afirkin at afirkin.com) ([Leica] IMG: Roofers at 2500 ISO)