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FORUMS Canon Cameras, Lenses & Accessories Canon EOS Digital Cameras 
Thread started 08 May 2014 (Thursday) 22:02
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Question on 5D III / 1D X Auto ISO

 
swldstn
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May 08, 2014 22:02 |  #1

In Auto ISO mode you can select a minimum shutter speed like 1/60 or 1/250, etc. There is an AUTO setting as well. I can find no description of how the AUTO setting works. What rules does it use. Does anyone know how it works or where to find a good description? I've search up and down both manuals with little luck. Help would be appreciated.


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rrblint
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May 08, 2014 22:34 |  #2

Auto Minimum SS would just be equivalent to no minimum SS being set.


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apersson850
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May 09, 2014 05:36 as a reply to  @ rrblint's post |  #3

Auto implies that the longest allowed exposure time is about 1/focal length. So it's not like having no limit at all, I'd say.


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rrblint
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May 09, 2014 07:13 as a reply to  @ apersson850's post |  #4

Then there is no way to set "no minimum shutter speed" as there will always be a 1/FL minimum...Interesting. Auto is as close to "no minimum SS" as you can get.


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May 09, 2014 07:46 as a reply to  @ rrblint's post |  #5

Since Auto will start raising the ISO long before you reach 1 second, which is the longest fixed time you can select, I think the 1 second setting is closer to no limit at all.


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May 09, 2014 07:57 as a reply to  @ apersson850's post |  #6

So with the 5D3 and a 500mm lens(for example) and enough light so that ISO doesn't max out, Auto will actually produce a faster SS than 1/250 minimum would. Nice to know.:)


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apersson850
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May 09, 2014 09:56 as a reply to  @ rrblint's post |  #7

I haven't tried to see exactly what happens, but I guess we'll have to bring our long lenses and teleconverters out to find out!


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May 09, 2014 10:01 |  #8

swldstn wrote in post #16891783 (external link)
In Auto ISO mode you can select a minimum shutter speed like 1/60 or 1/250, etc. There is an AUTO setting as well. I can find no description of how the AUTO setting works. What rules does it use. Does anyone know how it works or where to find a good description? I've search up and down both manuals with little luck. Help would be appreciated.

If you care about shutter speeds, it might be better to just shoot in Tv mode with auto-ISO. You then have access to EC as well. When I used that mode at the last two sporting events, the 5D3 floated the ISO much more than it touched the aperture. The aperture on my 70-200 stayed at f2.8 to f3.2, but the ISO shifted between 8000 and my set max. It is as close to nearly a perfect auto-ISO mechanism for what I shoot without the 1DX's capabilities/settings that the 5D3 doesn't have.


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rrblint
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May 09, 2014 10:10 |  #9

apersson850 wrote in post #16892597 (external link)
I haven't tried to see exactly what happens, but I guess we'll have to bring our long lenses and teleconverters out to find out!

Please let me know the results.


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swldstn
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May 09, 2014 18:56 |  #10

Where, in what manual, does it says Min. Shutter Speed set to Auto is a 1/f rule? I can't find a statement other than Auto is "Auto". Heck that means it can do what ever it wants with no explanation IMO.


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May 09, 2014 21:46 |  #11

swldstn wrote in post #16893849 (external link)
Where, in what manual, does it says Min. Shutter Speed set to Auto is a 1/f rule? I can't find a statement other than Auto is "Auto". Heck that means it can do what ever it wants with no explanation IMO.

That info does not appear in the manual. It was probably stated elsewhere in an article by a Canon spokesman such as Chuck Westfall.


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timbop
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May 10, 2014 08:17 |  #12

apersson850 wrote in post #16892194 (external link)
Auto implies that the longest allowed exposure time is about 1/focal length. So it's not like having no limit at all, I'd say.

IIRC, this is how it works in "auto". I remember reading it somewhere when I first got a 5d3


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apersson850
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May 10, 2014 10:30 as a reply to  @ timbop's post |  #13

The user's manual is indeed good to read, but sometimes knowledge can be acquired simply by using the camera and observing the behavior.


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Question on 5D III / 1D X Auto ISO
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