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GrinMode · 11-08-2010, 09:57 PM

Is there any real world difference between the expanded (K-x / K-r) and the native (K-7, etc) ISO 100?

And is the expanded ISO 100 perceptibly better that the native ISO 200?

Thanks in advance

mysticcowboy · 11-09-2010, 12:13 AM

I have not found the expanded 100 ISO any better than shooting a native resolution of 200. It's nice to have if you want to smooth water or wind, but you'll have a difficult time seeing any differences otherwise.

gazonk · 11-09-2010, 01:50 AM

Originally posted by GrinMode

And is the expanded ISO 100 perceptibly better that the native ISO 200?

I don't have the K-x, but according to DxOmark, you get 0.6 EV more DR at ISO 100, so in theory, for "one shot HDR" type images, you have a little more room at ISO 100 (in fact, according to DxO again, ISO 100 DR on the K-x is quite close to ISO 200 on the K-5).

**kiwi_jono** · 11-09-2010, 02:56 AM

On my K-x I see quite a lot of difference between ISO100 and 200.

ISO100 is significantly cleaner in the shaddow areas.

GrinMode · 11-09-2010, 03:24 AM

Thanks for all your replies.

I actually compared the K-x, K-r, and K-7 in DXOMark. The expanded 100 scores better than the K-7's native 100.

But I'll just put on record that I'm not bashing the K-7 here, and I'd like to consider what the others are saying about the DXOMark's (in?)significance in real world scenarios.

I had googled about it and I found some info about expanded ISO (the lower range) actually reduces DR. But maybe it does not matter much with the K-x and K-r's very good DR.

I'm still on the fence between a K-7 and K-r

Thanks again.

11-08-2010, 09:57 PM	#1
GrinMode Senior Member Join Date: Mar 2010 Posts: 249	ISO 100: Expanded vs Native Is there any real world difference between the expanded (K-x / K-r) and the native (K-7, etc) ISO 100? And is the expanded ISO 100 perceptibly better that the native ISO 200? Thanks in advance

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11-09-2010, 12:13 AM	#2
mysticcowboy Veteran Member Join Date: Apr 2009 Location: port townsend, wa Photos: Albums Posts: 968	I have not found the expanded 100 ISO any better than shooting a native resolution of 200. It's nice to have if you want to smooth water or wind, but you'll have a difficult time seeing any differences otherwise.

11-09-2010, 01:50 AM	#3
gazonk Pentaxian Join Date: Feb 2009 Location: Oslo area, Norway Photos: Gallery \| Albums Posts: 3,746	Originally posted by GrinMode And is the expanded ISO 100 perceptibly better that the native ISO 200? I don't have the K-x, but according to DxOmark, you get 0.6 EV more DR at ISO 100, so in theory, for "one shot HDR" type images, you have a little more room at ISO 100 (in fact, according to DxO again, ISO 100 DR on the K-x is quite close to ISO 200 on the K-5).

11-09-2010, 02:56 AM	#4
kiwi_jono Loyal Site Supporter Join Date: Dec 2009 Location: Christchurch, New Zealand Photos: Gallery \| Albums Posts: 2,437	On my K-x I see quite a lot of difference between ISO100 and 200. ISO100 is significantly cleaner in the shaddow areas.

11-09-2010, 03:24 AM	#5
GrinMode Senior Member Join Date: Mar 2010 Posts: 249 Original Poster	Thanks for all your replies. I actually compared the K-x, K-r, and K-7 in DXOMark. The expanded 100 scores better than the K-7's native 100. But I'll just put on record that I'm not bashing the K-7 here, and I'd like to consider what the others are saying about the DXOMark's (in?)significance in real world scenarios. I had googled about it and I found some info about expanded ISO (the lower range) actually reduces DR. But maybe it does not matter much with the K-x and K-r's very good DR. I'm still on the fence between a K-7 and K-r Thanks again.

ISO 100: Expanded vs Native

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