I've been photographing high school track meets for years and have come to know the behavior of my K-3 very well, including during action sequences tracking runners, jumpers and throwers. I have learned when my K-3 was likely to get and keep action in focus, and when it was likely to lose focus, fall behind the action or simply fail to produce the kinds of results I desired from AF-C. I've been able to capture great photos of action with the K-3, but at the same time I have also had many failures which were simply beyond the camera's abilities.
I've been waiting for the new APS-C flagship to replace the K-3, and desperately wanted to see improvements that would have a visible, tangible improvement in auto-focus and use for sports. I bought a K-3 iii as soon as I could.
Today was my first chance to put the K-3 iii to the test at a track meet. The lens I used was the Sigma 70-200mm f2.8 APO DG HSM. 90% of photos were TAv mode, aperture was 3.5-5.6, and shutter speed was 1/800 to 1/2000. Shots were ~80% AF-C, Expanded Area AF-S, with AF hold OFF. AF-C release was focus priority for 1st frame and action. All images captured in RAW DNG to ProGrade 128GB UHS-II v90 card.
I took ~2500 photos, a mix of active, moving shots, still shots, long auto-bursts, intermittent bursts, tracking runners moving towards the camera, runners moving parallel to the camera. I put it to the test.
The results
exceeded my expectations. The K-3 iii delivered on its promise. It's the
real deal auto-focus and AF-C improvement I've been waiting for.
Some observations:
- Not every photo was in perfect focus, but my general hit rate was way better than I ever had with the K-3. And this is only my first time using the Mark iii, so I expect this to improve.
- Image quality is fantastic, and image noise is significantly improved over the K-3, even at low (100-400) ISO. I'm using a custom NR curve that turns the NR to the lowest level for ISO 100-800.
- The K-3 iii excelled at grabbing focus when rapidly switching between runners. One challenge is when there are multiple runners in the same heat that you want to capture. You need to grab focus on one, fire a quick burst then rapidly switch to the second runner, and try to get a burst in focus before they go past.
- The high FPS mode is great for jumpers/throwers.
- I often hit the buffer limit, causing me to miss some action. Buffer clearing time was very fast using the v90 SD card. I imagine that more careful use of the Medium and High drive modes will help alleviate that issue.
- I miss seeing the focus point in red using AF-C. Too easy to lose the black squares in busy backgrounds. I just had to hope the focus points were where I wanted them.
- Battery life is slightly worse than the K-3. I needed to swap the battery during the meet. A grip with a second battery is coming.
- Setting optimal customizations and settings for the E-dial will be very useful once I become more comfortable with the camera.
I've attached some sample photos from the meet. These are just quick exports to JPG. It is hard to "prove" that the K-3 iii performance is significantly improved just by posting a couple of JPGs, and these might not even be the 'best' examples I have to show what the K-3 iii can do. Rather, just consider them as evidence that I'm
really happy with my K-3 iii today.
Hope others find this useful. Let me know if you have any questions.
Cheers,
Mike