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12-02-2014, 12:44 PM   #1
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ISO Settings

Sorry for the noobish question, but I can't find it anywhere on the forums. I have seen a few posters mention different ISO settings that are not powers of 2 times 100(meaning standard settings would be 200, 400, 800....12800), but rather numbers like ISO 1250, 2500, 4000, 5000, or 8000. How do people use these settings? Am I just missing something here, since I only know how to use the power of 2 settings?



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12-02-2014, 12:50 PM   #2
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Its a complicated issue. The numbers you listed, 200, 400,.., are full stops. So going up one number will brighten the photo as much as changing one f-stop or one shutter stop.
You have a Menu option to allow Incremental ISO changes, in half stops (and possibly even in third stops). I think the option is called SENSITIVITY STEPS, and its near the middle of the Menu (beginning of the final section, one of the first subtabs)
There is an argument against using half and third values for ISO, though. Some say that these increments are not actually analog changes (sensor sensitivity), but are just digital brightening. There is debate about this. That being said, for most of us this is not really an issue that would be noticed in photos.
I don't use the half or third steps in ISO because I don't like scrolling so much when I change ISO.

Last edited by Na Horuk; 12-02-2014 at 12:56 PM.
12-02-2014, 01:44 PM   #3
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QuoteOriginally posted by Na Horuk Quote
I don't use the half or third steps in ISO because I don't like scrolling so much when I change ISO.
Good point! A half or third stop can be made up so easily in PP that it isn't worth messing with it when shooting.
12-02-2014, 01:51 PM   #4
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QuoteOriginally posted by willskywalker93 Quote
How do people use these settings? Am I just missing something here, since I only know how to use the power of 2 settings?
If you look at the Custom Settings Menu C1.2 you will see that you can set Sensitivity Steps either to one full EV step or to match your settings in C1.1 for exposure compensation, which can be either 1, 1/2 or 1/3 EV step. (EV stands for "Exposure Value").

I do find smaller than 1 Sensitivity Steps usefull, whenever I want to keep shutterspeed and aperture whitin a certain range of values (for motion- and/or depth of field reasons) and I find it particularly handy when I use the Tav - setting, where I set both shutter speed and aperture at fixed values and let the camera decide what ISO value will then produce the best image under the given ligtenning conditions.

It is a very nice to have option, and I do use it, but it isn't strictly "necessary".

12-02-2014, 02:21 PM - 1 Like   #5
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QuoteOriginally posted by Stone G. Quote
If you look at the Custom Settings Menu C1.2 you will see that you can set Sensitivity Steps either to one full EV step or to match your settings in C1.1 for exposure compensation, which can be either 1, 1/2 or 1/3 EV step. (EV stands for "Exposure Value").

I do find smaller than 1 Sensitivity Steps usefull, whenever I want to keep shutterspeed and aperture whitin a certain range of values (for motion- and/or depth of field reasons) and I find it particularly handy when I use the Tav - setting, where I set both shutter speed and aperture at fixed values and let the camera decide what ISO value will then produce the best image under the given ligtenning conditions.

It is a very nice to have option, and I do use it, but it isn't strictly "necessary".
Oh, I thought that was just for EV metering steps if shooting aperture priority or shutter priority (or auto, but I doubt many k3 users do such a thing). That option actually changes the ISO steps as well? Interesting. I'll have to play around with that after work. I got my K3 Friday and absolutely love it.
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