Rumors > EOS Bodies

5D MK 3 and auto ISO

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EvilTed:
I would have thought that the 'A' setting for ISO = Auto meaning that the camera picks the best ISO setting for the given conditions.

I tried shooting a 50 F/1.2 @ 1.2 indoors in dim light yesterday and it didn't seem to work as I'd thought.
Everything was underexposed and the historgram was heavily peaked to the left.

If I manually set the ISO to 1600 or above, thing were as edxpected.

What gives?

ET

neuroanatomist:
In Shooting Menu 2, there's a setting to select the range for Auto ISO - you might want to check that setting.  Also, did you have a flash attached?  If so, the ISO is fixed at 400.

PhilDrinkwater:
What setting were you using? (Manual, Aperture Priority, Shutter Pri)?

What was Exposure Compensation set to? Was there a light or window in the distance?

PhilDrinkwater:

--- Quote from: neuroanatomist on April 30, 2012, 12:09:50 PM ---In Shooting Menu 2, there's a setting to select the range for Auto ISO - you might want to check that setting.  Also, did you have a flash attached?  If so, the ISO is fixed at 400.

--- End quote ---

Ahh they're good points too.

h4ldol:

--- Quote from: EvilTed on April 30, 2012, 10:57:11 AM ---I tried shooting a 50 F/1.2 @ 1.2 indoors in dim light yesterday and it didn't seem to work as I'd thought.

--- End quote ---

Were you by chance shooting with the lens cap on?  On in the dark with an exposure of less than 2 minutes?  If so, you might have been experiencing the infamous LCD light leakage issue that people have been up in arms about recently.

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