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FORUMS Canon Cameras, Lenses & Accessories Canon EOS Digital Cameras 
Thread started 20 Oct 2008 (Monday) 16:56
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50D auto ISO

 
mrfourcows
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Oct 22, 2008 09:49 |  #16

Nervous wrote in post #6530846 (external link)
Need I say more? AutoISO on 40D actually knows just two values - 400 and 800 and in fact is unusable. 50D shows a HUGE improvement here and I would use AutoISO on 50D with no hesistation.

idk. i mean a single experience doesn't give the whole picture.

edit: read the part about the 40d manual stating that auto iso only works at 400-800.


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Nervous
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Oct 22, 2008 10:17 |  #17

Jaetie wrote in post #6540590 (external link)
idk. i mean a single experience doesn't give the whole picture.

edit: read the part about the 40d manual stating that auto iso only works at 400-800.

I know, but that doesn't make an excuse for AutoISO on 40D (AutoISO that works in 1 stop only, gosh!) Moreover, I was unable to see any values between 400 and 800, though I use 1/3-stop steps for ISO.


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RowdyReptile
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Oct 22, 2008 14:09 |  #18

sbbruin wrote in post #6536324 (external link)
new 5d DOES have this technology. its auto ISO works according to the lens you have mounted, so its set to a minimum shutter speed of 1/focal length. i know this will definitely work for primes, im not sure about the zooms.

this is the reason i was surprised to see the 50d do this, since it has to calculate 1/focal length x 1.6 crop factor. according to nervous, it looks like it does indeed perform this, and he did this with a zoom, so im assuming the new 5d wil work with zooms also. good implementation by canon, but still not quite up to the auto ISO of nikon. i agree, MUCH better than any other canon iteration thus far.

With all the calculations that go on inside a camera, the x1.6 conversion is quite trivial. The Speedlite 580EXII, for instance, adjusts to provide correct coverage for your given zoom, calculating for the 1.6 factor, as well.


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sbbruin
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Oct 22, 2008 14:53 |  #19

RowdyReptile wrote in post #6542142 (external link)
With all the calculations that go on inside a camera, the x1.6 conversion is quite trivial. The Speedlite 580EXII, for instance, adjusts to provide correct coverage for your given zoom, calculating for the 1.6 factor, as well.

wow, i had no idea, that is really useful to know. so the speedlite actually performs differently from crop to full frame cameras?? amazing indeed.

see, i thought manufacturers sorta catered to the full-frame crowd, so i didnt think that canon would even implement a 1.6 crop factor into their auto-ISO. but i agree, with the number of calculations that do go on inside of these digital cameras, nothing should be surprising me nowadays!




  
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RowdyReptile
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Oct 22, 2008 16:16 |  #20

sbbruin wrote in post #6542404 (external link)
wow, i had no idea, that is really useful to know. so the speedlite actually performs differently from crop to full frame cameras?? amazing indeed.

see, i thought manufacturers sorta catered to the full-frame crowd, so i didnt think that canon would even implement a 1.6 crop factor into their auto-ISO. but i agree, with the number of calculations that do go on inside of these digital cameras, nothing should be surprising me nowadays!

Yep! It's listed as the "Auto conversion of flash coverage with compatible digital SLR cameras" feature here (external link) and if you look at page 6 of the manual here (external link), you'll see the icon in the top right corner of the LCD, or page 21 for more details.


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Shooting
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Dec 16, 2013 19:05 |  #21

So the auto iso on the 50D won't go above 800? why not to the limit of 1600 or 3200?
especially for indoor sports shooting.




  
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Colin ­ Glover
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Dec 17, 2013 12:54 |  #22

Is the iso on my T3i/600D the same as the 50D or 60D?


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apersson850
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Dec 18, 2013 04:06 as a reply to  @ Colin Glover's post |  #23

The normal range of Auto ISO on the 40D was 400-800. At that time, Canon obviously thought that 400 was good enough for all shooting, so no need to go lower, and 800 was the upper limit for auto setting. Max was 1600 (within the standard range).

The 40D will go below ISO 400 in auto ISO only if proper exposure can't be accomplished on ISO 400, i.e. if you max out on aperture and/or exposure time with the lens you have.

The 7D is more useful, especially after the introduction of firmware 2, since it will go from ISO 100 to the limit you specify. Cameras like the 1DX allow you to set both upper and lower limits.


Anders

  
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50D auto ISO
FORUMS Canon Cameras, Lenses & Accessories Canon EOS Digital Cameras 
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