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10-10-2010, 07:47 PM   #1
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K-r vs. K-x in high ISO performance

How do the Pentax K-r and K-x compare in terms of high ISO performance? Is there any improvement or difference in terms of noise levels? Thanks,

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10-10-2010, 08:41 PM   #2
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I haven't seen any direct comparisons yet, but early reports say K-r is visibly better than K-x with respect to ISO performance. I guess we'll have to wait for actual comparative reviews...

Last edited by causey; 10-10-2010 at 09:05 PM.
10-10-2010, 08:58 PM   #3
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Too early to tell. Eventually sites like DXOMark will reveal all.
It's likely they will be similar though.
10-10-2010, 09:13 PM   #4
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QuoteOriginally posted by rawr Quote
Too early to tell. Eventually sites like DXOMark will reveal all.
It's likely they will be similar though.
If we need DxONMark to tell us, then I don't think there is much to talk about

10-10-2010, 10:57 PM   #5
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Maybe I just have a thing about French guys in lab coats. We all have our weaknesses.
10-11-2010, 12:02 AM   #6
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QuoteOriginally posted by rawr Quote
Maybe I just have a thing about French guys in lab coats. We all have our weaknesses.
You need to get that looked into, DXO also tells us that the Nikon D90 performs better than K-x, whilst a visual inspection at 6400 will tell you otherwise
10-11-2010, 03:46 AM   #7
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QuoteOriginally posted by Steelski Quote
You need to get that looked into, DXO also tells us that the Nikon D90 performs better than K-x, whilst a visual inspection at 6400 will tell you otherwise
DXO also tells you that the K-x NR kicks in at ISO 3200 and from there on beats the D90 in signal to noise ratio. So read the curves and everything turns out just fine.
10-11-2010, 03:50 AM   #8
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Ignore this post, what I was about to say was not interesting or funny , and the photo I was about to add was also not that interesting. I am spending too much time here in anticipation of the K-5.


Last edited by Stefan Carey; 10-11-2010 at 04:06 AM.
10-11-2010, 04:53 AM   #9
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QuoteOriginally posted by Gimbal Quote
DXO also tells you that the K-x NR kicks in at ISO 3200 and from there on beats the D90 in signal to noise ratio. So read the curves and everything turns out just fine.
Even if the nr kicks in, the k-x delivers more detail and less noise
10-11-2010, 05:51 AM   #10
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Even if they Kr is just a little better, the kx already has pretty impressive DR and noise control. It is hard to believe that we are not getting close to the limits of what is capable in an APS-C size sensor.
12-10-2010, 07:30 AM   #11
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I owned a K-x and sold it to get a new K-r . The K-r AF speed is better, but I don't think the K-r is better than K-x at the hi ISO performance, the K-x is slightly 'cleaner' .
12-10-2010, 01:11 PM   #12
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QuoteOriginally posted by sonnief Quote
I owned a K-x and sold it to get a new K-r . The K-r AF speed is better, but I don't think the K-r is better than K-x at the hi ISO performance, the K-x is slightly 'cleaner' .
The only comparo I saw showed no difference in noise between the K-r and K-x. The K-x images looked very slightly more detailed. It appears the improved sensitivity is limited to the K-5, the K-r didn't benefit.
12-10-2010, 02:58 PM   #13
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QuoteOriginally posted by Gimbal Quote
DXO also tells you that the K-x NR kicks in at ISO 3200 and from there on beats the D90 in signal to noise ratio. So read the curves and everything turns out just fine.
The K-x's noise reduction, and the K-r's as well I assume, kicks in when you TELL it to kick in via your preference settings.

And you can totally turn NR off anyway at all ISOs.

So:

Huh?
12-11-2010, 10:56 AM   #14
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QuoteOriginally posted by causey Quote
I haven't seen any direct comparisons yet, but early reports say K-r is visibly better than K-x with respect to ISO performance.
Be grateful for links to your references please?

There has been a thread in the K-r forum:
anyone did Kx to Kr?
take a look at Post #18 -
the links to the direct comparison photos seem to show that there was very little difference between the new K-r and K-x.

The referred direct comparison photos thread was by devorama:
K-r vs. K-x ISO samples (or return of the ISO flower!)

The direct links to devorama's side-by-side ISO flower comparisons

All sizes | high-key_ISO_elevator | Flickr - Photo Sharing!

All sizes | low-key_ISO_elevator | Flickr - Photo Sharing!

All sizes | grey_ISO_elevator | Flickr - Photo Sharing!

FWIW -
Later on in the thread in Post #23 direct comparison taken from dpReview of the K-x with the current top hotshots Canon 60D, Nikon 7000 and Pentax K-5 at ISO6400 and 12800 - show how well these new hotshots are doing against the K-x which is/was the leading HighISO APS-C.

Last edited by UnknownVT; 12-11-2010 at 11:07 AM.
12-11-2010, 11:06 AM   #15
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QuoteOriginally posted by UnknownVT Quote
Be grateful for links to your references please?

There has been a thread in the K-r forum:
anyone did Kx to Kr?
take a look at Post #18 -
the links to the direct comparison photos seem to show that there was very little difference between the new K-r and K-x.

The referred direct comparison photos thread was:
K-r vs. K-x ISO samples (or return of the ISO flower!)

The direct links to devorama's ISO flower comparisons

All sizes | high-key_ISO_elevator | Flickr - Photo Sharing!

All sizes | low-key_ISO_elevator | Flickr - Photo Sharing!

All sizes | grey_ISO_elevator | Flickr - Photo Sharing!

FWIW -
Later on in the thread in Post #23 direct comparison taken from dpReview of the K-x with the current top hotshots Canon 60D, Nikon 7000 and Pentax K-5 at ISO6400 and 12800 - show how well these now hotshots are doing against the K-x which is/was the leading HighISO APS-C.
My post is quite old--I was reporting the early conclusion of someone who had made a comparison; I think later the same person disproved that conclusion. In light of newer comparisons, it appears there is no difference btw. K-x and K-r.
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