Quick MkIII Focus test
Sorry but I couldn't remember the thread where I said I'd do a test, so I've started a new one. I didn't get to meet up with any Canon shooters using the MkII last weekend, only 30D and similar and lots of Nikons. I mean when I was shooting Nikon, I was always outnumbered by the Canon guys. Where were they all when I needed them last Saturday?
Anyway, this sequence is the closest I got to a test. I have to hand it to Rob Galbraith for putting the time into his tests, this just isn't easy unless you dedicate lots of time specifically to it. These are 600x350 pixel crops, the original image that you can see in the small film strip to the left of the crops. I saved the Jpeg at quality 9 so the crops look almost like they did before I saved the whole test file, sorry it's 432kbs as that's as low as I could go without it looking terrible.
The centre point of each crop is about where I had the centre focus point (as far as I remember anyway) and from that you can probably gather that the players were all over the place. Lens was the 300IS USM L shot wide open at f2.8 and the relevant camera settings were;
AV mode.
ISO 320.
Jpeg fine with no in-camera or PS sharpening.
AI servo, centre focus point, 5fps.
Shutter speed was;
1/2500sec on shots 1,2,3 and 9.
1/2000sec on shots 4,5,6 and 8.
1/1600sec on shot 7.
The whole sequence was shot over 2 seconds at I think 4fps.
Not very scientific I'm afraid, but I have to say I'm quite happy with it all and have had no problems.