[LRflex] Re: DMR Noise Quandary

David,

Thank you for your kind reply and thoughtful suggestions. I opened the
original robin DNG (RAW) file in Photoshop CS2 and saved it as a tiff file,
as you suggested, and gone to the Actual Pixels mode @ 100%. I can see the
mottled, grainy look in the out-of-focus areas but not very much at all
around the better focused bird. The effect does not seem to cover the frame
uniformly; I may be wrong.

I downloaded SilkyPix and will follow the same procedure with it and also
with Adobe Lightroom Beta 2, with which I have been experimenting, and see
what I can see, or not see.

Better yet, to really get at the matter, next week I'll set up a
one-variable experiment and make a series of exposures only varying one
parameter: the DMR ISO setting.

For the purist (I know some!), a second parameter will inexorably vary, the
time of day, which can make a huge difference in collision tests,
explosions, etc., but non-simultaneity shouldn't be an issue here. I can
then compare frames with all five ISO speeds. Should be fun.

One reason I am very interested in all this is that I am curious about what
the practical effect (versus the theoretical effect) of bumping up the ISO
may have on my pictures, especially the ones I will make during my coming
week in England. I'm only taking two f4 VE lenses and I am sure I'll be
tempted to do that.

In the best-of-all-possible-worlds, I'd like a plot of "Image Quality" vs.
ISO; maybe it has been done and I just don't know about it.

With thanks again and kindest regards,

Bill


David Young wrote:

> Bill Abbott wrote:


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