Most reviewers rated the K20D as slightly less noisy than the K7. Probably not enough to make a major difference. The rest of the package made the K7 a better camera.

On 8/24/2011 8:08 PM, Paul Stenquist wrote:
The K7 is a nice camera in terms of build and ergonomics, but it's a noisy 
beast -- no better than the K20 and probably not as good as the K10. The K5, on 
the other hand, is by far the best of the Pentax breed. You won't have any 
trouble convincing the rest of us that the K7 is noisy.

Paul
On Aug 24, 2011, at 6:59 PM, Tom Cakalic wrote:

It's occurred to me that many digital camera tests including the most
popular sites do not give an accurate representation of noise
generated by the camera sensor(s).

While they may do a fairly decent job of reporting on noise at a given
ISO, there seems to be no accounting for length of exposure, length of
continous camera operating time, ambient temperature, or in the case
of night shots, shadow noise, which is far more obvious, than noise
say on a light blue British postage stamp... all of which should
affect noise levels.

I attempted a series of 10 10-sec exposures @ ISO 800 last night with
the K-7. Ambient temperature around 60 degrees F. I had noise
reduction turned off. The camera had been operating for<  3 minutes
before starting.

First the camera gave up taking the shots after 5 exposures because I
only allowed a 1-sec interval between shots. However I was mortified
at the amount of noise present, which was totally out of line with
examples seen on dpreview. I'll try again tonight with NR on.

Thoughts?

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