First, some background info. My first DSLR was a K2000/K-m. Last Spring (2012) I decided it was time to upgrade, so I bought a used K-r, which I, for the most part, loved. This Spring (2013), I discovered the flash no longer worked, so I sent it for repair. When it seemed that was going to be quite a while, I bought a used K-x as a temporary stand-in. Not having the focus point visible in the finder took some re-getting-used-to, but the K-x reminds me a whole lot of the K2000, handling-wise, so I adjusted pretty quick.
This past week, I got the K-r back after having the entire top cover & e-dial replaced, plus a standard CLA. I took some sample shots with it and noticed that they all seemed a bit "off". I couldn't quite say how, they just didn't seem right. So, I decided to do an semi-scientific comparison by taking the same picture with the same lens on each of the two bodies. What I found kind of surprised me. Of the tests I did, I uploaded the most noticeable example shots to
this album. They were taken in RAW, and if you want to view the full DNGs, here you go:
K-x Sample DNG,
K-r Sample DNG
Both were taken hand-held from approximately the same position and with (as nearly as possible) the same settings on each camera (more on that in a moment) and using the same Tamron 28-75/F2.8 lens. The only discrepancy between the settings on the two cameras was that the K-r's shutter speed was 1/25, while the K-x's was 1/30. Interestingly, the shot from the K-r seems significantly softer or less-focused, especially in looking at the text on the plaque and the glass vase. I considered motion blur, but, if that were a factor, then the K-r shot would be sharper since it's using a faster speed.
I took dozens of other shots using other lenses (DA35/2.4 and A50/1.7) and the results are fairly consistent. Given that I was seeing this with a MF lens would seem to rule out any kind of focus accuracy issue, as well, although I was relying on the focus confirmation (beep& indicator) on each camera. My typical MF procedure is to go counter-clockwise with the focus ring until it just leaves focus, then, very slowly, turn clockwise until I reach the "middle" (as near as I can tell) of the "in focus" zone.
So, based on these photos, I'm inclined to stick with using the K-x as my primary, but I'd like to know what's causing the K-r's photos to be inferior. I believe both use the same sensor, and with the same lens, the optics are pretty much equal. Could I just have a lemon of a K-r?