Originally posted by jamesm007 Even it you take out the slight NR of the K20D, its still cleaner a bit, at high ISO. The K20D used a two channel design and K-7 a 4 channel which probably increased the noise a tad, this 4 channels was for faster FPS. Take a look at DPR review for some comparisons, or DXO or just about any reliable source.
There close, but the K20D is just better enough to notice. Not that it makes much difference as realistically you may as well say they are the same(?)... well
Now to counter this I bet Pentax made a deal with the devil and got to this day a sensor no one else has for its entry level K-x dSLR. This thing is really good, plain and simple. Does it have great ISO6400, no, but the pics are printable at 10X8, and its arguable the best high ISO APS sensor out; don't try that with the K20D without some serious PP work and luck
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from Dpreview, read the highlighted parts.
Image Quality
No reason to complain at base ISO: the K-7 images show good detail and natural colors straight out the box. Compared to the predecessor in-camera sharpening has been reduced which results in slightly softer but also cleaner looking output. Pixel peepers can revert to
shooting RAW which, in combination with some careful sharpening during the conversion process,
will result in some visible extra image detail. It's advisable though to use quality lenses if you want to make the most of the camera's 14.6 megapixel nominal resolution.
At higher sensitivities the picture doesn't look quite so good. JPEG noise is visibly and measurably higher than on some of the direct competitors. At default settings the K-7 retains relatively good detail up to the highest ISO settings but shows fairly large amounts of both luminance and chroma noise. Increasing the in-camera reduction will add some pretty heavy detail blurring to the mix. Some rivals, especially the Nikon D300, deliver a better balanced mix of noise reduction and detail retention.
However, when shooting in RAW the K-7's RAW noise is pretty much on the same level as the competition. Therefore, for maximum image quality in low light situations your best bet is shooting RAW and applying customized noise reduction in post processing.
All in all, apart from a slightly different tone curve, weaker default sharpening and slightly higher (!) RAW noise the K-7 output is very similar to the K20D. Purely from an image quality point of view there is therefore no urgent need to upgrade for current K20D users.
also try to look for JohnBee's tutorial on NR pp and look at the sample images done at ISO3200 and ISO 6400. really darn clean images with great detail. and it's not that complicated or difficult that you might think.
and Yes, my RAW images beat the hell out of my in-camera jpegs ay any given day.