Gonz wrote:
Did you see the updated image.
yes. Much better.
I think that 4 or 5 stops will show some amount of banding, but not enough to make much of a difference. Its when you have maybe 7-10 stops where you should notice a massive difference. If the whole theory that is being bandied about were true, i.e that the multiplication takes place post A/D convertor, then how many bits does that A/D convertor have? It would have to have quite a bit more than the stated 14 bits, that way they can multiply at will and have plenty of room for the dark regions to come out.
I think that what real world iso invariance means to me is that I have a lot more latitude to under expose by dialing the ISO down, so as not to blow out highlights, and similarly I don't have to worry about shooting at a higher ISO, within a reasonable range. I don't think it means I can go around shooting at base ISO all of the time.
For me, the lesson of all of this is the importance of trying things out, and learning what your system will do, and how it works best, when it doesn't matter, because at some point, you'll face a situation where your camera deviates from the textbook, and you won't have time to figure that out without missing the shot.
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