Originally posted by dosdan A desperate lighting situation.
Interesting analysis. Thanks for the comments and taking the time to look into things. I shot another rodeo at the same location in June, and the IQ of the results was generally poor, so I tried to learn something from that experience.
Quote: I'm surprised that 1/250s was fast enough here for the action, even with panning.
Last time I shot rodeo at the same location and time (evening), I 'borrowed' the camera settings of a guy who makes a living photographing these SE QLD rodeos by studying his EXIF. He always used 1/500 sec, f2.8 (on his Canon 1Dx with a 70-200 f2.8), and seemed happy to go over ISO 12800. However applying 1/500 to the scene in June meant I had to let the K-5 run up to ISO 25600 for many shots, and the results were not pretty. So this time I tried setting the shutter lower and generally the results turned out OK. At 1/500 both falling rider and bull would have been frozen, but at 1/250 if just the bull was frozen but the falling rider was blurry, that still looked OK. I think I even shot lower than 1/250 for a few bursts.
Originally posted by dosdan the lighting was very low, at least by professional sporting events standards.
Indeed. I wish they would hold these events during the day. Looking at the EXIF for some of these shots in PhotoMe, the LV across the metering segments was usually well below 4.
Originally posted by dosdan How fast was the AF performance under this lighting?
The AF speed was good, but the lack of subject contrast (low-light, black bull...) sometimes caused problems getting a lock. I also found if I used 5 point AF, the AF would grab a contrasty feature behind the target (eg a steel barrier railing behind the bull running directly towards me) rather that the rider's chest. I also tried AF.C in combination with 5 point AF but it was SLOW and killed the fps, and the tracking was unreliable, so I just mostly stuck to AF.S and centre-point AF.
Originally posted by dosdan you may be better off shooting raw at the max. ISO where analogue gain is still applied, and then boosting the rendering brightness in raw PP
That works to a degree. But taking it all the way down to ISO 1250 (the DxOMark ceiling), and then pushing up the exposure back to ISO 6400-12800 (effective) in post often means starting to see a lot of blueish read noise ugliness in the boosted scene, especially if the original scene was dim. I haven't experimented much with this approach, but that technique seems to work best if you shoot a bright scene at ISO 100 and accidentally under-expose it by 4 stops, for example, then need to recover it. Dramatic exposure boosting in PP doesn't seem to work as well, for some reason, if you are pushing a low-light scene.