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10-07-2014, 08:57 AM   #1
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expanded ISO on my Kx

My Kx normally has ISO capabilities from 200 to 6400. If I can use the expanded ISO to go down to 100 (the only end I care about, now at least) why don't they just put it on there in the first place? Do I loose something when I set to expanded ISO? If so, what, and how much?

10-07-2014, 09:02 AM   #2
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That is a really good question, I am curious to see if anyone has any ideas, I have the same thing on my K5.
10-07-2014, 09:06 AM   #3
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I don't think so, the iso100 is the best performing setting.

http://www.dxomark.com/Cameras/Pentax/Kx
10-07-2014, 09:15 AM   #4
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Gives excellent results. Go out and take pictures, try different settings nothing is going to break.
I don't have any Dxomark charts on my walls just great pics from my Kx !

10-07-2014, 09:37 AM   #5
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QuoteOriginally posted by RonHendriks1966 Quote
I don't think so, the iso100 is the best performing setting.

http://www.dxomark.com/Cameras/Pentax/Kx
So again, the question, why don't they just put it with the other settings? Why do I have to go enable expanded ISO?
10-07-2014, 10:01 AM   #6
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just guessing that iso100 and iso12800 are not native iso? but the product of processing? so they slow down the camera? (slower frame rate or lesser max number of frames for the buffer?), I haven't tried though, I rarely shoot in bursts.
10-07-2014, 11:09 AM   #7
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Short answer: You may lose some "highlight headroom". The K-x is designed around a base ISO of 200, so to get ISO 100, it actually overexposes, then adjusts. Apparently, the sensor actually does best at ISO 125 - see this (headache-inducing) discussion on that other site:

What's the deal with the Pentax K-X base ISO setting (ISO-200 vs "Extendable"-100)?: Pentax SLR Talk Forum: Digital Photography Review

Last edited by THoog; 10-07-2014 at 12:14 PM. Reason: Over, not under exposes.
10-07-2014, 11:10 AM   #8
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Is there one for the K5?

10-07-2014, 11:40 AM   #9
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QuoteOriginally posted by THoog Quote
Short answer: You may lose some "highlight headroom". The K-x is designed around a base ISO of 200, so to get ISO 100, it actually underexposes, then adjusts up. Apparently, the sensor actually does best at ISO 125 - see this (headache-inducing) discussion on that other site:

What's the deal with the Pentax K-X base ISO setting (ISO-200 vs "Extendable"-100)?: Pentax SLR Talk Forum: Digital Photography Review
not under you mean overexposes at 100.
this makes for the better iq

---------- Post added 7th Oct 2014 at 21:45 ----------

I read in some leica discussions of the trend to overexpose 1 stop to get the maximum of detail because that way they get the most information possible because the information in digital is not analog as in film. The best is to overexpose as much as not to burn any highlight. And then correct in pp.
10-07-2014, 12:06 PM   #10
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QuoteOriginally posted by jeantree Quote
So again, the question, why don't they just put it with the other settings? Why do I have to go enable expanded ISO?
They "resolved" the issue on future bodies- current-gen Pentax cameras don't have ISO expansion.

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10-07-2014, 12:14 PM   #11
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QuoteOriginally posted by climit Quote
not under you mean overexposes at 100.
Yep. Edited. Thanks.
10-07-2014, 01:57 PM   #12
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QuoteOriginally posted by Adam Quote
They "resolved" the issue on future bodies- current-gen Pentax cameras don't have ISO expansion.
Adam, it is not an issue.
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