Originally posted by PentaxPoke I understand that. Did you read my posts? That is why I made that exact point above (twice). I also understand exposure. For the third time: I chose that ISO and that EV number because it was convenient and easy to demonstrate the effect of exposure on noise at a given ISO.
My point was simply that underexposure is bad for noise. Not all new DSLR owners are aware of this. At some point the photographer needs to make a decision about the exposure. Unless you just pointed your camera at a grey card, there are still decisions you have to make about what is the proper exposure. My point is simply don't underexpose! If anything, shift to the right.
Point taken.
I misinterpreted your post and was under the impression by the demonstration method used that you advised people to overexpose using the EV method in high ISO usage.
The matter that remains to be solved is: right exposure with ISO versus over exposure with ISO x 2. Results may be non linear.
I do not have a K20D, but did try and test this with my K10D.
These are crops from dark parts of 4 pictures taken in my study: 1600 + Ev, 800, 800+1Ev, 400 ISO.
In order to compare the images side by side properly, I lowered the "over exposed" images with 1 EV in Lightroom before exporting.
See here the results for ISO 1600 +1Ev versus ISO 800:
ISO 1600 +1EV in camera, -1EV in Lightroom (nr off)
Attachment 12142
versus ISO 800, no EV compensation (nr off):
Attachment 12145
and for ISO 800 +1Ev versus ISO 400:
ISO 800+1EV in camera, -1EV in Lightroom (nr off)
Attachment 12144
versus ISO 400, no EV compensation (nr off):
Attachment 12147
Looking at the results (magnified), I guess the lower ISO results are the better ones.
- Bert