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How does Auto ISO in camera work?


5 years 6 months ago #605606 by Tsoto
Will auto ISO always pick the lowest ISO for the photo?  
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5 years 6 months ago #605608 by shelland
It will pick the ISO that it thinks gives the correct exposure for the photo. So similar to shooting in aperture priority the camera picks the shutter speed to give the 'correct' resulting exposure (taking into account exposure compensation you have set, etc). 

I've started using it more often shooting outdoor sports, because as I shoot in different directions or as cloud cover changes the shooting conditions change. I set my aperture wide open, my shutter speed to something reasonable for the day, and then let the camera choose the ISO  for the conditions of the exact shot. Which technically results in the lowest ISO setting it deems correct based on your other settings combined. 
Scott

- Twin Cities, MN
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5 years 6 months ago #605614 by KCook

Tsoto wrote: Will auto ISO always pick the lowest ISO for the photo?  

Canons do.  Fujis do not.  Dunno about Nikon or other brands.

Kelly
Canon 50D, Olympus PL2
kellycook.zenfolio.com/
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5 years 6 months ago #605623 by Nikon Shooter

KCook wrote:

Tsoto wrote: Dunno about Nikon or other brands.


I know only Nikon and yes!
You should make sure, however, to fine tune the limitations
of this option.

Light is free… capturing it is not!
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5 years 6 months ago #605634 by effron

Tsoto wrote: Will auto ISO always pick the lowest ISO for the photo?  


Nikons tend to use the highest ISO set in the menu. I for one never use auto ISO. Too easy to assign a quick ISO function anyway.
Why so serious?
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5 years 6 months ago #605639 by Nikon Shooter

effron wrote: Nikons tend to use the highest ISO set in the menu. I for one never use auto ISO. Too easy to assign a quick ISO function anyway.



I always use auto ISO in specific shooting situations
because of the reaction speed it allows.

May I disagree with the underlined statement?
Light is free… capturing it is not!
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5 years 6 months ago #605715 by G Vernon
I´ve never had issues with any of my two Nikons choosing anything other than the lowest ISO, you need to select the parameters correctly - i use auto ISO on manual settings occasionally when the sun is constantly in and out of the clouds otherwise its fixed if the ambient light is constant..
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5 years 6 months ago #607213 by Ozzie_Traveller
G'day Tsoto

Each of my panasonic camera bodies are set as "ISO=Auto with 800 max" and every day I'm out in the field I see the screen display mostly on ISO-100 but as light conditions change or shutter speed increases to > 1/1000 sec, the ISO will meander from maybe 160 to 800 along the way

If i'm doing landscape work in good lighting, the ISO nearly always is locked into 100-ISO ... so no worries there

Hope this helps
Phil from the great land Downunder
www.flickr.com/photos/ozzie_traveller/sets/
Phil from the great land Downunder
www.flickr.com/photos/ozzie_traveller/sets/
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