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D750 ISO settings


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#1 crbuckjr

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Posted 29 June 2016 - 05:27 AM

In certain situations I would like to set my shutter speed and and aperture and let the camera set the resulting ISO .  How do I do that?  I can't figure out the descriptions of the 3 ISO Sensitivity Setting in the camera's menu.

 

thanks for any help



#2 james23p

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Posted 29 June 2016 - 04:32 PM

I don't have a D750 but that is what most use Auto ISO for it will give you a range of ISO settings like 100-800 etc as you set the shutter speed and f stop the camera will adjust the ISO to meet your settings.

 

I am at work I will try to find it in the manual when I get off.

 

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#3 crbuckjr

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Posted 04 July 2016 - 03:37 PM

Thanks. There are some comfusing ISO settings but probably this will work.

#4 ericbowles

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Posted 05 July 2016 - 09:16 AM

It sounds like you need to use Manual exposure mode with Auto ISO.  Set the aperture and shutter speed as needed.  With Auto ISO the camera will determine the lowest ISO that provides the desired exposure.  Set the minimum shutter speed desired and the maximum desired ISO level.   Use exposure compensation as needed to maintain an accurate exposure.

 

I use this with changing light on the subject.  I use either Manual Mode or sometimes use Aperture Priority if I have some room to drop shutter speed.  If I have constant light on the subject, I just use a fixed ISO so all settings are locked in.

 

One advantage of this is the camera will pick ISO settings that might be between settings you can select.  It uses the lowest possible ISO for your parameters.


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#5 Sailjunkie

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Posted 05 July 2016 - 11:24 AM

Many thanks for the explanation, Eric.  

 

I've played with Auto ISO a couple of times.  Got mixed results.  Definitely the goofy user's fault, not the feature.  ;)

 

Because I definitely think that it could be a useful tool in the right situation, back to reading and playing with it more.


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#6 ericbowles

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Posted 05 July 2016 - 11:48 AM

I was using it for an event a couple of weeks ago.  The position of the performer on stage caused some lighting variation - too much to adjust for every image.  I used Manual exposure at 1/200 sec and f/4 with a 70-200 lens, and set Auto ISO with a top ISO of 6400.  I dialed in -0.7 stops to balance the exposure and keep from overexposing white shirts.  It worked very well - all exposures were pretty close and misses could be easily corrected in post.

 

I don't use Auto ISO for most outdoor images with constant lighting.  I lock in the right settings and don't care about backgrounds or light or dark subjects.  All my exposures are the same unless the light changes. 


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#7 Sailjunkie

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Posted 06 July 2016 - 12:22 PM

My complaint was with the resulting shutter speed.  I'm pretty sure that I can tweak that.  Just need to do a bit more homework.

 

I was shooting indoors when I used Auto ISO.  Like Eric, I'm not sure that I would use it very often outdoors.  

 

I think that it is worth making sure that I fully understand how Auto ISO works.  Added to my own "Do" list!  :)


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