7D shutter speed fall off

I shoot Rodeo in evenings I have my 7d Mark II on AV and Auto ISO /1000 but I found that the ISO set at min 400 but I find that the shuuter speed drops to < 1/500 when ISO is at 16000. Not sure what Setting I have wrong that forces the camera down. I will say I start at 7pm and end at 9
 

Valvebounce

CR Pro
Apr 3, 2013
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Isle of Wight
Hi Ronald.
First did you mean ISO 16000 or 1600? I would think it must be nearly dark if you are up to 16000, not a big surprise it can’t sustain 1/1000s
It sounds like you might have the ISO range limits set to 400-16000 (or1600?), second red tab, it could still be that if you were expecting higher ISO’s!
It also sounds like you have safety shift enabled, it will ensure a balanced exposure if the settings are way off, not helpful in some circumstances.

Cheers, Graham.
 
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Hi Graham, yes I ment 16000. in Auto ISO I had either 1/500 or 1/1000 shutter speen and ISO range from 400-16000. shooting outside in the summer, around 20:30 time the light is falling off fast. The arena has poor lighting. I checked and safety shift was "OFF" I will play around and see what I can find out.
 
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