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

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Subject: [Leica] IMG: Roofers at 2500 ISO
From: afirkin at afirkin.com (afirkin at afirkin.com)
Date: Sun, 31 Oct 2010 02:12:17 -0400
References: <AANLkTimLBd+r-paAxBmfyGqeUM2oNdVqoQCfX71z+11o@mail.gmail.com> <c2f43104afef294b0c518967627b5f64.squirrel@emailmg.globat.com> <AANLkTik9ErpP4g1p6myNd8wCTXaopYb4Nz0ucJ1tHcw+@mail.gmail.com>
 
> That's easy. Its not so much the total mumber of photons in your bucket as
> the signal/noise ratio. Sort of how much gin (good electrons) you put in a
> glass with a fixed amount of vermouth (noise)
>
> Sandy Mcguffog explains it very well as part of this article
>
> http://chromasoft.blogspot.com/2009/09/why-expose-to-right-is-just-plain-wrong.html
>
> Cheers
> Geoff

Not sure I totally agree: he says that the total noise is fixed for each
exposure, and is effectively "masked" by the image photons. I need to
think some more about this.

Cheers

Alastair
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)
Message from hopsternew at gmail.com (Geoff Hopkinson) ([Leica] IMG: Roofers at 2500 ISO)