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Auto ISO Setting


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#1 okuma

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Posted 21 April 2012 - 11:49 AM

Does any one have any experience/comments in using this setting on wide angle shots?

Any pros or con opinions?

Thanks in advance !
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#2 ChrigelKarrer

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Posted 22 April 2012 - 03:01 PM

As you got no answer and i don't understand the sense of your question, i con only tell you:
I use fixed iso values as i like to decide the aperture/shutter values.
I have no exact idea when exactly the camera crank up the ISO, but i am sure that the sports or
night program will crank up the ISO earlier than other programs or manual exposure settings.

My first UW-Camera was a Fuji E900 and she started to crank up the ISO quite early leading to very noisy pictures,
so i started to set the ISO by my self to avoid that.

Chris

P.S. If you try to do Wide Angle with ambient light i still beloive that a manual setting of the ISO value will
lead to better results than AUTO ISO mode.

Edited by ChrigelKarrer, 22 April 2012 - 03:03 PM.

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#3 ATJ

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Posted 22 April 2012 - 05:57 PM

I have not used Auto ISO underwater but I have above water and it does have its uses. I found it worked best when you want to set a specific shutter speed and aperture but the conditions are changing. Set the camera on manual, choose the shutter speed and aperture you want and the camera will choose the ISO to match. If you are balancing strobe with ambient light you may want to play with exposure compensation on bother the camera and the strobe to get the right balance.

#4 pKai

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Posted 26 April 2012 - 12:46 PM

Auto ISO is something to be avoided. I've observed ChrigelKarrer's Fuji experience on Canons and Nikons at all price points. Seems like the software developers think cranking up the ISO early is good. Obviously they are not photographers.

Select the ISO appropriate for the situation -- low ISO when there's lots of light... higher (to a point) when not. If you want to do something special like use an ultra-small aperture and want to preserve a certain shutter speed... then by all means crank up the ISO -- just know you're getting some noise. Its better than "surprise" noise when the camera thinks ISO 3200 is a good idea in 30' of water on a sunny day -- I've seen this.

Edited by m1mm1m, 26 April 2012 - 12:46 PM.


#5 derway

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Posted 04 May 2012 - 09:38 AM

Using auto iso in M mode, when the camera allows, prevents this 'cranking up the iso'. It can only set the iso to the right value to match the aperture and shutter speed, to the light level.
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#6 okuma

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Posted 04 May 2012 - 10:47 PM

Thank you for your responses.
Don; your response in most logical!
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#7 ChrigelKarrer

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Posted 05 May 2012 - 07:05 AM

The Nikon User manual for the D7000 explains on Page 103:

Adjust settings.
The maximum value for auto ISO sensitivity can be selected using Maximum sensitivity (choose lower values to prevent noise in the form of randomly-spaced bright pixels, fog, or lines); the minimum value for auto ISO sensitivity is automatically set to ISO 100. In modes P and A, sensitivity will only
be adjusted if underexposure would result at the shutter speed selected for Minimum shutter speed (1/40001 s; in modes S and M, sensitivity will be
adjusted for optimal exposure at the shutter speed selected by the user).
Slower shutter speeds will be used only if optimum exposure can not be achieved at the ISO sensitivity value selected for Maximum sensitivity. If the
ISO sensitivity selected by the user is higher than the value selected for Maximum sensitivity, the value selected for Maximum sensitivity will be
used instead.).


This settings will help to avoid motion blur and too high Auto ISO values.

Chris

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