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05-03-2010, 01:47 AM   #1
alphalt
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K-x extended ISO range

Hello all,

I just want to ask about extended ISO range. Is it "real" sensitivity from sensor or it is some kind of software made sensitivity ? I mean if I use ISO100 would it be real sensitivity read from sensor or all images will be passed through some kind of software filter ?

05-03-2010, 04:04 AM   #2
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It's real.
05-03-2010, 04:15 AM   #3
alphalt
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Thanks for answering. It was strange to me why we have ISO100 and we have some restrictions to some functions ? I thought if its real then all functions should work, but ok if its real then I'm happy
Thanks again.
05-03-2010, 04:22 AM   #4
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Since it is an entry level camera, I think Pentax restricted some of the more challenging settings.
E.g. low ISO = long shutter speed = blurr.

05-03-2010, 06:20 AM   #5
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The native ISO of the K-X is ISO 200. ISO 100 is achieved through software and darkening of an ISO 200 image in the same way that ISO 12,800 is achieved by a software brightened ISO 6400 (or 3200, whichever is the top non-extended)
05-03-2010, 08:07 AM   #6
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I'm sorry, but that's wrong.
Gordon Goodsman has shown that the base ISO of the Kx is somewhere around 125.
05-03-2010, 08:22 AM   #7
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QuoteOriginally posted by blende8 Quote
I'm sorry, but that's wrong.
Gordon Goodsman has shown that the base ISO of the Kx is somewhere around 125.
regardless, the K-X cannot do native ISO 100 and it is simulated in software.
05-03-2010, 08:44 AM   #8
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How do you know?
It could also be done by hardware gain control and I think it is, since the S/N and DR is linear from ISO 100 to about 1600. AFAIK above 1600 some on-sensor noise reduction is applied.
But the real truth probably only Pentax knows.

05-03-2010, 10:09 AM   #9
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QuoteOriginally posted by blende8 Quote
Gordon Goodsman has shown that the base ISO of the Kx is somewhere around 125.
Can you share the link please.

Thanks
Yusuf
05-03-2010, 10:30 AM   #10
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I don't have a link.
It was on dpreview around January, when Gordon had a lot of time.
There was lots of discussion on this and similar topics.
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