BEST dynamic range at ISO X at YOUR dslr?!

Started May 18, 2010 | Discussions thread
chuxter Forum Pro • Posts: 21,685
Re: Dynamic range at ISO X at MY DSLR

milt95033 wrote:

The D90's base ISO is 200. This chart seems to say that when digital pushing is used to get 100, the dynamic range is increased. This is so strange I suspect something is wrong with the chart.

I agree...the data is suspect. I was curious how he got this mixed up, so I went to his site and found the following:

" Photographic dynamic range is a practical measure of the ability of the sensor to capture an image that will have acceptable noise at a normal enlargement and viewing distance.

This is distinctly different from dynamic range as defined in engineering terms. "

He does some strange (to me) "adjustments" of the data...for example, the:

" SNR values are adjusted for the Circle of Confusion (CoC) that is appropriate for the sensor size. "

I didn't find a good description of exactly what he did or why he thought this was necessary.

BOTTOM LINE: William J. Claff invented a different definition of "Dynamic Range" to suit his purposes. Personally, I ignore people and stuff like this.

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Charlie Davis
Nikon 5700, Sony R1, Nikon D50, Nikon D300
“ for and of itself – photographs taken
from the world as it is – are misunderstood as a
collection of random observations and lucky moments...
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