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FORUMS Canon Cameras, Lenses & Accessories Canon EOS Digital Cameras 
Thread started 05 Mar 2012 (Monday) 16:43
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Auto ISO on 5D3

 
ejenner
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Mar 06, 2012 10:50 |  #31

John Sheehy wrote in post #14034931 (external link)
Heck, I wouldn't mind if aperture was still selected on the lens; that makes things much simpler when using adapters!

THIS. Period. Then Tv mode would work - when do I ever not care about aperture?


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hyolee
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Mar 06, 2012 14:10 |  #32

John Sheehy wrote in post #14034822 (external link)
Why would you want to lose the ability of fill flash in manual exposure (Tv/Av priority)?

That is a valid point, and everyone may differ on their preferred setup, but here's why I think it's better for Auto ISO to choose the lowest ISO for proper flash exposure:

Fill flash is well served by aperture priority. Since Auto ISO makes the most sense for run and gun handheld photography, you are likely limited in shutter to what you can handhold and the sync speed to maintain flash power. 1/60-1/200. There is a custom function that allows you to force shutter speed to be 1/60, 1/200, or float between those two values.

The other side of the spectrum, all flash no ambient, is done in manual. There currently is no automatic ISO to optimize for this. You may out of habit choose ISO 400 when you could have shot at ISO 100 with enough flash power.

If you want a mix of ambient and flash, you have to manually adjust the ISO to change the ratio of the two.

With this setup, you have auto ISO at opposite sides of the spectrum (full ambient and no ambient), and have to resort to manual ISO if you want to blend the ambient with the flash.




  
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hyolee
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Mar 15, 2012 20:19 as a reply to  @ hyolee's post |  #33

Just downloaded the 5D3 manual and here are my findings:

You can only select minimum shutter speeds between 1/250s and 1s in full stops. This might be annoying to people who are shooting sports who would want minimum shutter speeds of 1/500s or 1/1000s.

Auto ISO with flash is still a little confusing. From a cursory reading, the auto ISO with flash is disappointing:

Fixed at ISO 400
If fill flash results in overexposure at ISO 400, ISO 100 or higher will be used
Green box and P modes auto select 400-1600 which seems arbitrary

However, there is a safety shift custom function that changes ISO speed and says "will take effect if necessary even if flash is used". If I can set that, and shutter speed is limited to 1/200 without HSS, and the camera chooses an ISO that properly exposes the ambient, I am golden.




  
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Invertalon
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Mar 16, 2012 14:45 |  #34

For those who want this feature (EC while using auto ISO in M mode), send an email to Canon about it! If they get enough people bothering them they may add it. Worth the two minutes it takes to email them... I sent mine, hoping for the best in the future. I wanted this feature forever, although I *could* do without, it would be really nice...

So yeah, send an email!


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Auto ISO on 5D3
FORUMS Canon Cameras, Lenses & Accessories Canon EOS Digital Cameras 
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