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Subject: "RE: Exposure Latitude and Noise on the D70"

Lorin (et al),
OK, I don't have any formal wear handy and the weather is terrible so this will have to do
This time it's 9 images in 1EV steps from -4 to +4.
D70 50mm f/22 ISO 200 on tripod using timer (ambient light, no flash)
30ss upper left to 1/8s lower right
Loaded with ACR into CS adjusted to the same Exposure in ACR:
This time the +4EV and +3EV do look different; but +2 EV to -4EV look pretty much the same!
But take a look at these 400% crops:
Underexposing definitely hurts!
So, it still looks like expose to the right, even if it's two stops.
Bill

Original Message

"Exposure Latitude and Noise on the D70"
Posted by bclaff on 12-Oct-05 at 10:55 PM

I took the following 9 images varying exposure by 1/3EV from +1 1/3EV in the upper left to -1 1/3EV in the lower right:
D70 50mm f/1.8 ISO 200 on tripod using timer (ambient light, no flash)
1/8s upper left to 1/50s lower right
The raw images were brought into PhotoShop CS using Adobe Capture Raw (ACR) and identical settings.
The progression from overexposed to underexposed is fairly clear.
I brought the same images into CS with ACR and using the Exposure value to compensate for the over and under exposures.
Here is the result:
At first glance these exposure adjusted images all appear to be identical.
Finally, from these adjusted images I prepared 400% crops from the center of each image:
Close examination shows that there is more apparent noise in the lower right (underexposed images) than in the upper left (overexposed images).
This experiment supports at least two conclusions:
Shooting raw and adjusting exposure in ACR can be very forgiving.
"Exposing to the right" results in the least amount of visible noise.

Of course both conclusions are provided you don't clip image areas you care about.
(In this case, for example, there are specular highlights even in the most underexposed image.)
Bill

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