Do You Use Auto ISO?

I remember in my Nikon days auto ISO worked better and more completely than it did on Canon.

I know in last firmware update on my 1Dx they improved it. I still don't fully know how to set it. But however it's set it appears as if when I'm in AV, and select auto ISO, it will not let my shutter drop below 1/500 or possibly 1/650th, not sure, and adjust the ISO accordingly.

While I've never liked high ISO on any of my bodies, I guess it's better than my not noticing a too slow shutter speed and winding up with motion blur.

Agree?

And kindly explain, and please dumb it down, how to set the choices for shutter speed and anything else affected by choosing auto ISO on my 1Dx and 5D3 and if they are they same or different.
Mark

I tried Auto ISO on my 5DIII a few times. I'd use it a lot more if you could use Exposure Compensation at the same time; I always use +1/3 or more EC... with both my 40D and 5DIII; the exposure is always a bit too dark at '0'.

When shooting hummingbirds I like a certain shutterspeed for wing blur, and a certain aperture for just the right DoF. Auto ISO would be perfect for that situation (because of changing light) if I could use EC.

I almost never use Auto ISO for stills on my 70D. I only put it on when my wife uses the camera, as the exposure triangle is still a baffling mystery to her

However, in movie mode it is quite useful.

Canon has an excellent article on the feature at http://www.learn.usa.c​anon.com …es/2012/eos_Aut​oISO.shtml. Note it is 4 pages long.

And specific to the 5DIII go to http://cpn.canon-europe.com …ion/tipsandtric​ks/3284.do

I usually use auto ISO when I'm in TV mode with moving subjects and not consistant lightning, those are moments when speed is important and is allows me quite often to avoid to put by default an higher ISO in order to be sure that exposure will be OK.

When I have time or when there are no lightning issues, I set it manually.

It is ridiculous that it doesn't use exposure compensation with auto ISO. Canon must have a very weak internal QA process to allow lame crap like that through.

Auto ISO doesn't allow Exp Comp? I'm pretty sure it does on the 5DIII

I just shot an outdoor event where half the people were in open sunlight and half were in shade. I bounced back and forth between -2/3rds and +2/3rds in AV mode using Auto ISO. Exposure came out as expected.

Reiep wrote in post #17048087
I usually use auto ISO when I'm in TV mode with moving subjects and not consistant lightning, those are moments when speed is important and is allows me quite often to avoid to put by default an higher ISO in order to be sure that exposure will be OK.

When I have time or when there are no lightning issues, I set it manually.

same for me. shooting football when half of the field is bright and the other half is in the shade due the sun hitting the stadium at such angle.

nighthawk82 wrote in post #17048058
I almost never use Auto ISO for stills on my 70D. I only put it on when my wife uses the camera, as the exposure triangle is still a baffling mystery to her

Send the wife to http://www.canonoutsid​eofauto.ca/play/.

chris_holtmeier wrote in post #17048126
Auto ISO doesn't allow Exp Comp? I'm pretty sure it does on the 5DIII

I just shot an outdoor event where half the people were in open sunlight and half were in shade. I bounced back and forth between -2/3rds and +2/3rds in AV mode using Auto ISO. Exposure came out as expected.

I would certainly hope so. My comment related to a reply above which stated that it did not.

MDJAK wrote in post #17048039
I remember in my Nikon days auto ISO worked better and more completely than it did on Canon.

I know in last firmware update on my 1Dx they improved it. I still don't fully know how to set it. But however it's set it appears as if when I'm in AV, and select auto ISO, it will not let my shutter drop below 1/500 or possibly 1/650th, not sure, and adjust the ISO accordingly.

While I've never liked high ISO on any of my bodies, I guess it's better than my not noticing a too slow shutter speed and winding up with motion blur.

Agree?

And kindly explain, and please dumb it down, how to set the choices for shutter speed and anything else affected by choosing auto ISO on my 1Dx and 5D3 and if they are they same or different.
Mark

Actual Auto ISO images.

day to day shooting, almost always using it. Usually in AV mode, unless I really need high shutter speed past 1/250, then I will go in TV mode.

chris_holtmeier wrote in post #17048126
Auto ISO doesn't allow Exp Comp? I'm pretty sure it does on the 5DIII

I just shot an outdoor event where half the people were in open sunlight and half were in shade. I bounced back and forth between -2/3rds and +2/3rds in AV mode using Auto ISO. Exposure came out as expected.

magwai wrote in post #17048144
I would certainly hope so. My comment related to a reply above which stated that it did not.

Sorry, I was speaking of Auto ISO in Manual mode, not Av or Tv. Unless there's updated firmware I don't have, I can't adjust EC in Manual mode with Auto ISO.

[QUOTE=John from PA;17048135][QUOTE=nig​hthawk82;17048058]I almost never use Auto ISO for stills on my 70D. I only put it on when my wife uses the camera, as the exposure triangle is still a baffling mystery to her

Send the wife to http://www.canonoutsid​eofauto.ca/play/.

That is a very good site interactive demo! Thanks!