ISO

13 years 6 months ago #2982 by Andy
I have been reading about photographers using manual settings combined with auto ISO.
My first question is does the auto ISO only work to a certain ISo range or should the whole ISO range be available? I have a Canon 7D I sat down and tried to figure this out but my camera ISO does not seem to want to go over 3200.


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13 years 2 months ago #26823 by turtle
The whole range should be available, but the camera will (or at least should) always try to use the lowest possible ISO setting (least amount of noise). Due to the aperture & shutter speed selected for any particular shot, available ISOs will fall within a certain range.


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13 years 1 month ago #35456 by Rob pix4u2
Available light might also be a factor in the ISO range

Remember to engage brain before putting mouth in gear
Rob Huelsman Sr.
My Facebook www.facebook.com/ImaginACTIONPhotography

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13 years 2 weeks ago #42989 by dlambert
I believe auto-ISO is limited to 3200. This is an arbitrary limit, but it's generally related to the idea that the noise level is going to start getting pretty noticeable above this level, so it's a setting best left to the photographer to make him or herself.
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13 years 2 weeks ago #42991 by photobod
Always try to have your ISO set to the lowest setting possible in any given situation bar one, and thats if you actually are looking for grain in your photos, take your camera off auto anything and experiment, its digital so it wont cost you anything. :thumbsup: :thumbsup: :thumbsup:

www.dcimages.org.uk
"A good photograph is one that communicate a fact, touches the heart, leaves the viewer a changed person for having seen it. It is, in a word, effective." - Irving Penn

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13 years 2 weeks ago - 13 years 2 weeks ago #43147 by Stealthy Ninja
Have your iso high enough that you'll get the shot. nuff said :thumbsup: :thumbsup:
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13 years 6 days ago #46921 by Henry Peach
The answer is in your camera manual. It is not uncommon for auto-ISO not to cover the entire ISO range possible with a camera. The manufacturers don't want the camera to push the limits on it's own. If you want to use the highest ISOs they want the photographer to take control of that. Then they don't get so many complaints "Hey! This fancy camera is taking really noisy shots!" ;) Some cameras allow you to set the range for auto ISO in the custom functions.
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12 years 11 months ago #50518 by KCook

turtle wrote: The whole range should be available, but the camera will (or at least should) always try to use the lowest possible ISO setting (least amount of noise). Due to the aperture & shutter speed selected for any particular shot, available ISOs will fall within a certain range.


At least with my 50D it's very true that the AutoISO always goes for the rock bottom ISO possible. As if Canon's programmers assume we all lug tripods around. Very frustrating for casual use, when you just want to snap off a quick shot, and not worry about blur due to subject motion. So I don't agree at all that the AutoISO "should" always try for minimum ISO.

Nikon is ahead of Canon on this score, they at least provide for setting AutoISO limits.

I've been having my best luck with AutoISO in the Tv mode. But have seen some wild AutoISO settings in A-DEP mode too.

Kelly Cook

Canon 50D, Olympus PL2
kellycook.zenfolio.com/

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12 years 11 months ago - 12 years 11 months ago #50933 by Henry Peach

KCook wrote:

turtle wrote: ... you just want to snap off a quick shot, and not worry about blur due to subject motion. So I don't agree at all that the AutoISO "should" always try for minimum ISO.


:agree:

Even my ancient Canon 20D is incredibly clean at ISO 400 and below, and with the DSLRs I'm using today noise is never an issue as long as the exposure is good, except possibly at the very extreme high ISOs. Camera shake is a much greater concern to me. I'd like to see customizable programming for the auto ISO, aperture, and shutter features. I would be more inclined to use Av, Tv, and P if I could.

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