I am wondering about the Canon 5d2 L setting for ISO. It is supposed to be ISO 50 - which is all fine and dandy.
What I am wondering about though, is whether it is "real"? Why I am wondering, is that it is hidden in the "expanded ISO modes" - e.g. it is not available by default, you have to make a concious descision to be able to enable it. This makes good sense for the last two (highest) ISO settings of 12.800 and 25.600 - since the image quality is degraded to an unuseable extend, and you'd only want to use these for specific uses, such as very low light documentary or stuff like that where getting A picture is better than getting NO picture.
But, since the ISO50 is also hidden under the "concious descision" modes, I fear this is because the ISO is not a "real" one, rather it is some approached gimmic, like a software ND filter or some marketing crap.
Anyone have insights on this? For studio work where I can control the light will ISO 50 give me cleaner files than 100 on the 5d2 or is it some pseudo low iso setting ?
I will test this myself when I have the time to do so properly - but I am hoping someone has some insight on this too.
Thanks.