[Leica] IMG: Roofers at 2500 ISO

[jbm at jbm.org (Jeff Moore)]

2010-10-30-22:32:57 Howard Ritter:
> 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.

Well, maybe.  But I also note that when there's bright light, it's
usually sunlight, while dim light is often something with a warmer
color balance like incandescent lights (or candles).  When I
particularly notice noise, it's often when I start with something with
very little blue energy in it naturally, and try to balance the color
temperature out to look not-entirely-orange.  That requires cranking
up the underexposed blue pixels, which respond by peppering the frame
with blue noise.

Or is it some entirely diffrent phenomenon you're talking about?

 -Jeff