5D III can't change ISO to 100

[RedShoesGirl]

i am using a 1 year old 5D III. i never really thought about it, but i assumed i could not shoot a lower ISO than 200.

but looking at exif data in other photograhers' photosi see ISO of 100.

i thought cool. because that is what i used mostly on the 7D.

but i couldn't change the ISO lower than 200. moving the dial the ISO goes from 200 to A.

so i got out the manual. i know a clever idea. followed the directions on ISO settings. and still, no joy. looked online. same directions. same results. i was desparate so had a nikon friend take a look. same results. nothing lower than 200.

i am assuming i am missing a step somewhere.

i shoot RAW without jpg.

RSG

[hsbn · Accepted solution]

If you have High Tone  Priority turn on, you cannot use ISO100. If you shoot RAW, then High Tone Priority is pretty useless, may as well turn it off.

[RedShoesGirl]

LOL! such a simple thing. i noticed in the little screen the little D+ but didn't know what it meant. so when going through my settings a couple of weeks ago, high tone priority sounded like a good thing, right?

DUH!

thanks so much, really do appreciate the quick reply. 🙂