Re: Why an istDs?

[Godfrey DiGiorgi]

Dario,

I looked at your photos but cannot make a case to myself that these  
photos show representative behaviors of the two cameras accurately.

What I mean is: to answer the question "does one body have more  
exposure latitude than the other?", I'd have to have a RAW image  
taken with the exact same lighting and exposure settings, or an un- 
altered in-camera JPEG image taken with the same parameter settings,  
both of the same target and taken from the same position with the  
same lens, to give me confidence that I was seeing a difference  
characterizing the two cameras accurately.

RAW format exposures should be definitive. For in-camera JPEGs, you  
also have to allow for possible differences between in-camera RGB  
rendering and JPEG compressions settings.

For example, a Canon 10D and a Canon 300D use the same sensor and  
similar capture/rendering chipset, but Canon sets the defaults for  
the 10D differently form the 300D *and* what the parameter settings  
mean are not 1:1 mappings. I found that I could get JPEGs that looked  
almost identical to the 300D on its defaults by up setting  
Saturation, Contrast and Sharpening parameters, but I couldn't get  
the 300D JPEGs to match the 10D's using the 10D's default parameters  
as the 300D controls had a coarser adjustment range. The RAW files  
from both cameras were insignificantly different at the same exposure  
settings however.

I don't know whether the same is true of the D vs DS with regard to  
JPEG rendering, but it should be for the RAW capture.

Godfrey