Originally posted by lightbox Do you use a handheld spot meter, or do you prefer the one built into your camera?
Other than, perhaps, some kind of specialized studio work I can't imagine where TTL metering would not be preferred.
So far as I'm concerned this is pretty much the final word on the subject:
-------------------------------------------------------------------------------------------------
Film-Based Exposure Metering
It is remarkable, but all digital cameras of which I am aware expose digital sensors as if they were film. In other words, the metering aim point is 18% grey.
While this was sensible for film, it makes no sense for digital. The cleanest stops are the ones in the highlight area, and these are where the most data is located. The noisiest stops are in the shadow areas and this is where each stop contains less and less data.
Putting the exposure so that it lies in the middle makes no sense. Imagine that you’re photographing a black cat sitting on a pile of coal. The camera will make it look like a grey cat sitting on a pile of grey coal. Now imagine that you’re photographing a white cat sitting in the snow. The camera will also expose this as a grey cat sitting on grey snow. Both of these are wrong. Indeed all photographs should be exposed so that the image is recorded as light as possible.
In other words, so that the exposure is as far to the right of the histogram as possible, without blowing the highlights. This will maximize the amount of light being captured and thus create a lower noise image. But that’s not what cameras do. Why not?
The answer that some camera makers have given me is that over-exposed looking images would not be what raw shooters want to see on their rear LCD. Also, camera generated JPGs need to look like fully baked images.
In my opinion these are bogus arguments. The cameras knows exactly what is happening to each pixel in an image in terms of exposure. This is how live highlight warnings are generated. There is therefore no reason why the camera can not adjust the actual exposure that is recorded so as to “expose to the right“, while still showing a normalized rear LCD image.
Also, in anticipation of this, the very smart folks at Adobe have had a data field in the DNG format for years that is available to indicate an exposure normalization value. This means that raw files could be shot that are properly exposed for digital, that appear normalized on the rear LCD, and also (optionally) in a raw processing program.
Now the challenge is out there. Who will be the first camera maker to create a camera that does proper digital exposure and gains between a one and three stop noise advantage in the process?
----------------------------------------------------------------------------------
Link to the above:
https://luminous-landscape.com/rantatorial/they-just-dont-get-it/