Hello to all,


Just come back to a mountain shooting at 3100 meters, , with the 7d.


Weather : sunny with a light fog (i.e. luminous but partly foggy).


My question : all pics have been taken at 320 ISO and they all look kinda noisy (at 100%).


Is is specific to that kind of weather / heights ?


Is it specific to the 7D ?


I didn't make much ISO changes because it seemed to me that 320 was quite good (knowing that I needed speed to shoot fast action)


What did I do wrong ?


Thansk for your advices.