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Pentax K30 has best low-light APS performance



 
 
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  #1  
Old October 30th 12, 12:11 AM posted to rec.photo.digital.slr-systems
Rich[_6_]
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Default Pentax K30 has best low-light APS performance

http://www.dpreview.com/reviews/pentax-k-30/19

  #2  
Old October 30th 12, 08:13 AM posted to rec.photo.digital.slr-systems
Me
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Posts: 241
Default Pentax K30 has best low-light APS performance

On 30/10/2012 12:11 p.m., Rich wrote:
http://www.dpreview.com/reviews/pentax-k-30/19

DXOmark tests show it applies NR "significant smoothing" to raw files at
ISO 1600 and above, and DPR comment that ISO is overstated by 1/3 stop.
So...
  #3  
Old October 30th 12, 10:10 AM posted to rec.photo.digital.slr-systems
Trevor[_2_]
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Default Pentax K30 has best low-light APS performance


"Me" wrote in message
...
On 30/10/2012 12:11 p.m., Rich wrote:
http://www.dpreview.com/reviews/pentax-k-30/19

DXOmark tests show it applies NR "significant smoothing" to raw files at
ISO 1600 and above, and DPR comment that ISO is overstated by 1/3 stop.
So...


Seems there is no end to the cheating manufacturers now go to, to get better
looking test results from the uninitiated. Fortunately some reviews are
awake to their tricks at least.

Trevor.


  #4  
Old November 1st 12, 09:37 PM posted to rec.photo.digital.slr-systems
Me
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Posts: 241
Default Pentax K30 has best low-light APS performance

On 1/11/2012 2:24 p.m., RichA wrote:
On Oct 30, 3:13 am, Me wrote:
On 30/10/2012 12:11 p.m., Rich wrote:http://www.dpreview.com/reviews/pentax-k-30/19

DXOmark tests show it applies NR "significant smoothing" to raw files at
ISO 1600 and above, and DPR comment that ISO is overstated by 1/3 stop.
So...


I looked at it against the competition at 6400 and it looked good.
It's got less noise at that ISO than the D800.

It's amazing how effective noise reduction can be.
You can apply noise reduction to the D800 file if you choose.
With the K30 - you can't undo the noise reduction that's been applied
in-camera to the raw file.
  #5  
Old November 3rd 12, 12:45 AM posted to rec.photo.digital.slr-systems
Me
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Posts: 241
Default Pentax K30 has best low-light APS performance

On 3/11/2012 12:59 a.m., John A. wrote:
On Fri, 02 Nov 2012 07:35:02 -0400, John A.
wrote:

On Fri, 02 Nov 2012 09:37:30 +1300, Me wrote:

On 1/11/2012 2:24 p.m., RichA wrote:
On Oct 30, 3:13 am, Me wrote:
On 30/10/2012 12:11 p.m., Rich wrote:http://www.dpreview.com/reviews/pentax-k-30/19

DXOmark tests show it applies NR "significant smoothing" to raw files at
ISO 1600 and above, and DPR comment that ISO is overstated by 1/3 stop.
So...

I looked at it against the competition at 6400 and it looked good.
It's got less noise at that ISO than the D800.

It's amazing how effective noise reduction can be.
You can apply noise reduction to the D800 file if you choose.
With the K30 - you can't undo the noise reduction that's been applied
in-camera to the raw file.


Can it be turned off in the camera's settings?


Looking at the manual, it has a "High-ISO NR" setting that can be set
to Auto (default), Low, Medium, High, Custom (choose levels per ISO),
or Off. Does the review say what settings they used?


From DXOMark results "Off" isn't off.
http://i48.tinypic.com/2hi9dv4.png
That compared to D7000 Nikon, essentially the same sensor (sure there
may still be minor differences)
The plots track almost identically - as you'd expect, until ISO 1600,
but then the "measured" s/n ration for the K30 is almost exactly the
same at ISO3200 as ISO 1600. It's not possible unless they apply NR to
raw files, even with high ISO NR set to off. DXOMark annotate the chart
with "K30 - smoothed" at over ISO 1600.
It's deliberate "cheating" IMO. I'm glad DXO nailed them.
But Pentax sucked in RichA - and probably many others.



There's also a Slow Shutter Speed NR setting which I think controls
when and if it will automatically take and apply a dark frame after
the shot. Settings: Auto (based on shutter, ISO, & internal temp.), On
(any shot 1 sec or longer), or Off. (Wish my k20d had "Off".)

IMHO, test shoots in general aught to include shots with the default
settings, with all image enhancements off, and with settings optimized
(perhaps by the manufacturer's pros) for maximum image quality for the
shot in question. That would illustrate its out-of-the box
performance, baseline image capture capabilities, and what-it-can-do.


  #6  
Old November 3rd 12, 01:39 AM posted to rec.photo.digital.slr-systems
Wolfgang Weisselberg
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Posts: 5,285
Default Pentax K30 has best low-light APS performance

Rich wrote:
http://www.dpreview.com/reviews/pentax-k-30/19


.... if you read "performance" as "in JPEG: overly saturated and
with less fine detail (look at the yellow feathers)", then
you might be right. Oh, and it has less pixels, too ... so
for a fair comparison you'd have to upscale its' image.

-Wolfgang
 




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