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01-24-2010, 12:15 AM   #1
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ISO locked on K-x?

Hi there,

I just got my new pentax k-x and I am kind of surprised since the ISO is locked between 400-6400.

According to the manual and what I have seen around it shoudl be ISO 200 as a minimum standard.

There might be a setting I am missing, can someone help find out why I can't get the IS0200?

Thanks!


01-24-2010, 12:47 AM   #2
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If you're using an automatic mode, then you adjust which ISO the AUTO setting should be using. If you're in manual mode, just push the ISO button and set your ISO. In the menu you can also expand the ISO to 100-12800, this is done in the Custom tab on page 1, #3 in the list.
01-24-2010, 01:49 AM   #3
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Hi Netrex,

Thanks for your answer,

Actually whatever mode I am using, the range of ISO is limited between 400 to 6400, meanwhile it should between 200-6400.

That s why I am wondering whether there are some kind of settings locking the ISO at a certain level.

Last edited by JONNY1981; 01-24-2010 at 02:02 AM.
01-24-2010, 02:19 AM   #4
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Can't remember exactly what setting it is, but I think it has to do with the features 'highlight compensation' and/or 'shadow compensation'.

Once your back to the default setting of 200-6400, you can extend that to 100-12800 in the customs menu. Sorry I can't give specific information, but I don't have my Kx with me at the moment

01-24-2010, 02:57 AM   #5
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Hello, it's because you have highlight compensation on, turn it off to get the original ISO starting at 200 without expansion.

I'm not sure why it does that, can anyone explain the technical reasons for bumping up the iso to make a difference on highlights? I would think to reduce highlights the iso would go down.
01-24-2010, 03:02 AM   #6
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QuoteOriginally posted by Mr.Turnip Quote
Can't remember exactly what setting it is, but I think it has to do with the features 'highlight compensation' and/or 'shadow compensation'.

Once your back to the default setting of 200-6400, you can extend that to 100-12800 in the customs menu. Sorry I can't give specific information, but I don't have my Kx with me at the moment
I just checked, and you're right, like fan22 just wrote also, it's Highlight Correction that does it.

QuoteOriginally posted by fan22 Quote
Hello, it's because you have highlight compensation on, turn it off to get the original ISO starting at 200 without expansion.

I'm not sure why it does that, can anyone explain the technical reasons for bumping up the iso to make a difference on highlights? I would think to reduce highlights the iso would go down.
I think it gives you double the dynamic range, meaning one more stop of light to use. I don't know the technical reason for it not to do it at ISO 200 though. I believe I've heard that ISO 100 cameras go to ISO 200 when this is on (The K200D maybe).
01-24-2010, 06:31 AM   #7
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yeah the k20d goes to 200 iso when dynamic range expansion is on.
01-24-2010, 06:57 AM   #8
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How does highlight correction different from exposure compensation?

01-24-2010, 07:40 PM   #9
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Thank you very much guys, I will try this tonight and let you know then
01-24-2010, 08:47 PM   #10
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QuoteOriginally posted by dragonfly Quote
How does highlight correction different from exposure compensation?
Highlight correction shortens exposure a bit in an attempt to capture bright detail, and then tries to correct the less bright areas of the image so that they look like they were taken normally. Itís a manipulation of the captured data, and so itís a post-capture operation.

Exposure compensation (called EV compensation on the K-x) is a pre-capture setting. It is used to shift the actual exposure reading. In essence, it is shifting the meter one way or another. Itís called exposure compensation, rather than exposure shift, because the idea is that you are compensating for scenes that are fooling the meter, such as a snow scene (comes out grey without +EC) or a black cat (comes out grey without -EC.)
04-28-2010, 06:49 AM   #11
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QuoteOriginally posted by fan22 Quote
Hello, it's because you have highlight compensation on, turn it off to get the original ISO starting at 200 without expansion.

3 months later...

The power of the Internet and the joy of these forums!

I was experiencing the same problem as the OP - and three months after fan22 posts the above comment helps me out too!

Thank you fan22, whoever you are, wherever you are. Much appreciated!
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