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06-30-2011, 09:06 AM   #1
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expanded sensitivity ?

expanded iso sensititivity,

what is this for ?

and why is the lowest iso 200 without using the above feature ?

06-30-2011, 09:31 AM   #2
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This setting boosts the ISO range to 100-25600 instead of 200-6400.

Pentax thinks that there is negligible gain outside of the standard ISO range, and it's conceivable that outside of the standard range, software does most of the work rather than the sensor.

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07-01-2011, 01:07 AM   #3
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so i take it that iso 100 does not provide better quality than iso 200 on the pentax k-r ?
07-01-2011, 01:17 AM   #4
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QuoteOriginally posted by mrfatpooh Quote
so i take it that iso 100 does not provide better quality than iso 200 on the pentax k-r ?
correct but itdoes allow you to use a slower shutter speed than iso 200 in any high bright situation or if you are trying for a slow shutter speed to say slow blurry wave or water effect in a image.

07-01-2011, 01:34 AM   #5
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If you check DXO you'll see iso80 has a greater dr than iso100 or iso200
07-01-2011, 03:25 AM   #6
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QuoteOriginally posted by twitch Quote
If you check DXO you'll see iso80 has a greater dr than iso100 or iso200

what is dr ?
07-01-2011, 03:28 AM   #7
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dr = Dynamic range
07-01-2011, 03:30 AM   #8
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QuoteOriginally posted by twitch Quote
If you check DXO you'll see iso80 has a greater dr than iso100 or iso200
and DXO what where is that ?

07-01-2011, 03:38 AM   #9
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so are you saying the pentax k-r does iso 80 ?

I have expanded the sensitivity and can now see iso 100, but not 80 ?
07-01-2011, 03:41 AM   #10
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QuoteOriginally posted by mrfatpooh Quote
so are you saying the pentax k-r does iso 80 ?

I have expanded the sensitivity and can now see iso 100, but not 80 ?
Sorry, K-5 does 80, K-r & K-x only go down to 100. But still, DR at 100 is better than 200. Google DXO.
07-01-2011, 03:43 AM   #11
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thanks for the info Twitch
07-02-2011, 06:11 AM   #12
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QuoteOriginally posted by twitch Quote
Sorry, K-5 does 80, K-r & K-x only go down to 100. But still, DR at 100 is better than 200. Google DXO.
Might be correct if ISO 100 was a true ISO 100. Expanded sensitivity on the low end often (depending on how it is applied) overexposes by 1 fstop then truncates the highlights and leads to a reduction in Dynamic Range.
07-03-2011, 06:01 AM   #13
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I have noticed slightly less noise (not that there's much at all on either) with ISO 100 than 200, so there is some benefit there.
07-03-2011, 07:52 AM   #14
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QuoteOriginally posted by ccd333 Quote
I have noticed slightly less noise (not that there's much at all on either) with ISO 100 than 200, so there is some benefit there.
when you print it at 4x6 inch.. none would notice the differences between 100 200 or 640 .. so, turn off the expansion, enable highlight correction youll get better result
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