Below are several of the better shots taken from a youth premiere soccer match. The lens used was the Sigma 100-300mm f4. The time of day provided a good test for both the K-3 and the lens as the first half was in diminishing daylight, and the second half was under the lights.
To level-set matters, both the camera and the lens were new to me. I've been shooting outdoor soccer regularly for the past four years with a Canon 7D and the Canon 100-400mm f4.5-5.6 L lens.
The 7D + the 100-400mm are pretty much the best APS-C performance body and reasonably priced super-telezoom combo going. It gives me a standard to judge most aspects of the K-3 + Sigma against.
This was also my first time using the K-3 grip. Things started off poorly as the camera immediately froze, leaving me flabbergasted and a bit nervous as I wanted to test a few things out in those 10 minutes prior to the match. I quickly removed the grip and did a quick in/out with the battery and things were OK. I've never had a DSLR freeze before so it's an unwelcome item to stash in the back of my mind with this camera,
That said, I'm very happy to have the grip. To me it is essential to help balance the large size and weight of the Sigma lens. Without the grip the camera felt too small and unstable. For chaotic sports like soccer I eschew camera supports with these sized lenses.
One of my objectives this evening was to test out the different AF modes and menu settings, as well as pay attention to how usable the Pentax menu and button interfaces are. Having owned three prior Pentax DSLRs I was fairly familiar with the Pentax way and routinely switch between using the 7D and my K20D for all sorts of photography. But I know things have changed.
I also want to set some scope here: my impressions of the K-3 are very preliminary. Shooting sports (and birds) is not easy at all. It takes a lot of time to configure any camera to match one's particular shooting approach, and then for the user (me this time) to develop that seamless feel with the camera. I pretty much shoot on trained instinct as I've learned the movement of soccer well, and I'm also aware that half the time I'm uncertain if what looked good in the viewfinder will transform. Stuff happens too fast and too much: typically I'll generate about 1500 shots.
A bit about expectations. First, neither the 7D nor the K-3 is among the best sports cameras out there. I'm just not good enough, and there isn't anything close to a ROI, to make it worth purchasing a Nikon D4 or a Canon MKIV and comparable superfast AF glass. But if I can freeze action, have it in focus, and have enough keepers to convey the event accurately, then I'm a happy man.
The AF settings I’m still figuring out, but this is what I used:
16. 1 Release priority
17. 1 Focus-priority
18. 3 medium
I started off mistakenly with AF.S mode but decided to go with it for a short while just to see. The results weren't terrible but having to keep pressing the AF button to track action was too much of a hassle. I always use back-button focus (that's a Canon world term).
Next I chose AF.C and somehow the spot focus was my mode. It responded OK to slower action but was outpaced overall when I simply held down the AF button and changed targets. So I again had to keep pressing the AF button to capture action in close proximity to the original target. This felt like too much nursing for fast action.
Most of my time was spent with AF.C and the Expanded Area Small setting or the Expanded Area Medium setting. I didn't see a significant difference between both of these modes.
Unlike the spot AF, I was able to keep the AF button pressed for extended periods, tracking action in and out of frame. Both modes missed about half the time, especially the first shot of a sequence. Looking at the EXIF, it seems like the AF system needed about 2 seconds to lock on the target of a moving soccer ball or player; once acquired, it would stay on target rather nicely. In comparison, my 7D would be about 20% more accurate right away. Where this really matters is when I quickly swing the camera about 30-degrees to capture a quick header 30 yards away. Once target is locked however, both the K-3 and the 7D performed about the same—which is saying a lot for the K-3.
Where the K-3 really excels--and this is the big gain for me--is its ability to work in lower light.
I put my 7D away if I cannot get 1/500 at ISO 3200. That means rainy grey Pacific Northwest days, and times when stadium lights are being used at dusk and later. With the K-3 I was able to get acceptable shots at dusk at ISO 6400 and then under the lights at ISO 12,800. Some of that is the Sigma's constant f4 compared with the 100-400's f4.5-5.6. But a lot is the superior sensor. It was quite satisfying being able to shoot under the lights and most likely reason enough to keep the K-3.
I have not yet performed any lens AF calibration or testing. I do use faster memory cards that claim 90+MB/second speed.
Other factors: In changing the AF and focus point modes I really started to dislike the info screen. It's annoying. There are too many unimportant options there and the presentation is too cramped. The 7D's QuickScreen has about 15 items; the Pentax, 19. The graphics on the Canon are simply easier to read and act on.
While the K-3's viewfinder is pleasant and good, the 7D's is a little larger and noticeably brighter. And the on/off grid is excellent.
The push/pull zoom control of the Canon 100-400m lens lets you change focal length a little quicker than the Sigma. That matters in a fast moving sport.
During an injury break or after a questionable call I’ll chimp to see what happened. It took way too long for a string of five shots to appear on the rear LCD immediately after the shot. I have been spoiled by the 7D’s two processors. I hope Ricoh can speed operations along some with a firmware update.
Summary: Overall,the K-3 AF is competitive with the 7D using the lenses I noted. While the 7D's AF seems 20% quicker and more accurate in good outdoor light, the K-3's superior sensor allows it to be used in darker, stadium-lighted venues. That opens significant new territory for Pentax shooters. Now Ricoh has to focus on hiccup-free performance.
I abandoned Pentax for shooting sports four years ago, so the reality that the K-3 is "good enough" for my needs is indicative of what a fine camera the K-3 is overall. Ricoh (and third parties) has to fulfill the whole promise of this good camera by releasing modern zoom super-telephoto lenses.
I hope you find this useful.
M
1/750 @ f5.6, ISO 3200
1/750 @ f5.6, ISO 3200
1/500 @ f5.6, ISO 3200
1/500 @ f5.6, ISO 3200
1/750 @ f4.5, ISO 6400
1/1000@ f4.5, ISO 6400
1/750 @ f4.5, ISO 6400
1/750 @ f4, ISO 6400
1/500 @ f4, ISO 12800
1/750 @ f4, ISO 12800
M