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01-18-2011, 02:18 PM   #1
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Why would you want Expanded Sensitivity off?

Seems to me there is no downside?? If you don't want the extra high ISO's - don't use 'em...

What am I missing?

01-18-2011, 02:25 PM   #2
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Maybe if you just want to be able to mindlessly use the edial and not worry about going past 12800.

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01-18-2011, 02:26 PM   #3
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Maybe to show that it's beyond the sensors native capacity?
01-18-2011, 02:36 PM   #4
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I agree with the OP....seems kinda pointless.

Although perhaps the "..showing it's not a native ISO" is a good point.

01-18-2011, 03:14 PM   #5
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I don't have a K-5, but on my K-x I always leave the expanded range off because I do not want to use ISO100 in general shooting. The IQ difference b/w ISO100 and ISO200 on a K-x is practically zero, but it costs me shutter speed. Unfortunately there is no way to have auto-ISO use expanded ISO at the top and but not at the bottom. Not sure how the K-5 works though....
01-18-2011, 03:36 PM   #6
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But the difference between ISO 6400 and 12800 on a k-x is significant, so having sensitivity expansion off makes sense in case you do dial all the way without thinking, but don't want to suffer with software enhanced exposure.
01-18-2011, 05:24 PM   #7
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I think, the main reason is, some magazines and reviews have a test criteria "max ISO" (in default settings)

That means, if max ISO is 12800, the noise of 12800 is reviewed.
if the max ISO is 6400, the noise of 6400 is reviewed.
01-19-2011, 05:50 AM   #8
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QuoteOriginally posted by twitch Quote
I don't have a K-5, but on my K-x I always leave the expanded range off because I do not want to use ISO100 in general shooting. The IQ difference b/w ISO100 and ISO200 on a K-x is practically zero, but it costs me shutter speed. Unfortunately there is no way to have auto-ISO use expanded ISO at the top and but not at the bottom. Not sure how the K-5 works though....
Are you sure you are not confusing expanded sensitivity with extended dynamic range? Extended dynamic range cuts of the low ISO setting.

01-19-2011, 09:16 AM   #9
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QuoteOriginally posted by Delgado Quote
Are you sure you are not confusing expanded sensitivity with extended dynamic range? Extended dynamic range cuts of the low ISO setting.
What he means is that in expanded mode, the K-x goes to 100-12800, but he doesn't want it to go down to 100 (which it always will if bright enough), because he wants to keep a high shutter speed. He wants it to be 200-12800.

On the K-x there is no way to do this, but on the K-5, it is possible to set both the high and low range of auto ISO.
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