Полезная инфа по сони а900 (Eng)

1. Optimal ISO range is 320-800, 320 is the best, top limit depends more on your converter and taste, so decide for yourself. This means that in this range you don't underexpose and bump ISO if needed, but you don't go above the top limit and start underexposing. If you need high quality low ISO go with good ND or polarizer.

2. Wouldn't bother with ETTR - this camera is better than that, just shoot as you did on film, by meter, and your colors will be better.

...