Originally posted by bladams I was impressed with the specs and reviews of the K-3. Based on what I had read, I began to doubt the wisdom of waiting for FF to upgrade from my K-5. Then when the recent price reductions showed up, I couldn't resist. I took the plunge, ordered the K-3, battery grip (it was free, why not) and treated myself to a second flash unit at a greatly reduced price. I am mostly thrilled. The difference in the sharpness of my images without the low pass filter is astounding, especially with premium glass. I was, however taken aback by the presence of (to me) objectionable noise at relatively low ISO values, 200 and 400 ISO even. With the K-5 I didn't usually notice noise until ISO 800 or greater. OK, I thought, AA filters blur the image, noise reduction filters blur the image, maybe what I am seeing is noise that would have been invisible with the K-5 because of the AA filter. I also admit that I am pixel-peeping more with the K-3, I am still astounded by the crispness of my images even at 100%. Sharp edges that previously would have been blurry lines. But there is a nagging doubt. How do I know if what I am seeing is normal, or if I have a defective camera/sensor? I am bothered a little because I have seen no mention of this problem in any forum discussions. If this is normal, surely someone else would have noticed and commented.
Don't get me wrong, I still love the camera, and if adding noise reduction has to become part of my standard post production workflow, I am fine with that. Just want to get rid of that nagging doubt, if you know what I mean. Comments, please.
I upgraded from a K-5 to a K-3 and if you pixel peep at iso 800 and higher, there does seem to be a
bit more noise, but it's luminance, not chroma. In practice, this cleans up very well and you would not notice it in print, nor when posting photos online. I found the noise difference between the two cameras are exacerbated if you shoot JPG. If you shoot RAW, then there is really not much difference and I prefer the K-3's noise as it is more film like as well. The higher dot pitch of the K-3's 24 MP sensor means that one should expect more noise than a 16 MP sensor of the same size. Pixel peeping is not the proof, your final print or online posting is.
In my experience, the K-5 has worst chroma noise and that's the stuff which is ugly. With the K-3, I am confident shooting RAW to ISO 6400 before noise is a real issue. Also, bear in mind that compared to the K-5, the K-3's RAW files require far less sharpening (if any) and that helps mitigate noise. I do all my development in Lightroom 5 and a good combination of conservative sharpening and masking with noise reduction makes noise practically a non-issue at ISO 3200 and below. I would have no problem blowing up any K-3 image shot below 1600 ISO to poster size. Even 3200 ISO should be fine printed to 16x20 provided you got good exposure.
IMHO there is no question that the K-3 is superior in every way to the K-5 series. Just shoot RAW and learn the optimal way to process your images according to your sensor. I've always found the JPG engines on all my Pentax cameras, except for the Q10, shortchange the sensor's true capabilities. Each camera has its own "best recipes" to get the most out of your RAW files. Over time, I have customized a set of presets that are automatically applied according to different ISO's when I import my RAW files. This gets me about 90% into the "zone" for good sharpening and noise reduction balance.
Each time I use my K-3, it blows me away