Originally posted by jpzk OK, got that now from at least two people: yourself and Lowell, above: turn the SR off.
There is an interesting article about VR here:
Nikon VR explained
It's for Nikon but I think it should apply to all SR systems: Do not use SR when not necessary, do not use it at all on very fast shutter speed (1/500s and above).
Originally posted by jpzk Using AF.C in the past has been diappointing to say the least, but I will try it again with the local seagulls!
As opposed to Lowell, you suggest using the full AF matrix ... what if the bird is far enough that the AF may lock on an unwanted target?
To say the truth, I have not a lot of BIF experience (more with moving humans) and yes AF-C on the K10D and K20D was frustrating. It's better on the K-7 but it's not a miracle either. I found multipoint too slow on the K20D, on the K-7 it seems to be better for keeping the target in focus though.
Originally posted by jpzk I can see that this would be ideal when the bird is close enough and with a contrast differential adequate for the AF to really lock on the target ... I am assuming.
But if the bird is very far, do you really need AF? Focusing to infinity may be good enough. Of course, if you're talking about birds in a cluttered environment, the multipoint may not be the best choice indeed. I had a BIF with a sky background in mind when I said multipoint was better.
Originally posted by jpzk And, would you also use Tv mode rather than Av, especially when considering turning the SR off?
It would depend on the quality of light. But you can think about TAv also: set the shutter speed to a safe speed (let's say 1/500 or faster) and good enough aperture. When you stop down, you have more DOF and thus more margin for AF errors. A rule is that you need 2 stops to double the DOF. You may also use a slightly less long focal length and crop to again get more DOF.
And even better mode for AF speed would be manual. Once you know the light, it doesn't change a lot unless you shoot birds with much different reflectiveness or there's clouds masking/unmasking the sun. Again the camera will spend less processing power to guess the correct exposure. Manual WB can help too to reduce the CPU load.
Originally posted by jpzk I have one more situation to discuss:
there is that large hawk (a rough-legged hawk) which can be spotted often flying over farmers' fields this time of the year.
The hawk has typical brownish-beige coloring and that makes it almost "invisible" although the human eye can track it no problem.
With that in mind: a moving/camouflaged target .... how would you attempt to capture that?
Let me tell you that I have a near 100% failure rate under such circumstances.
JP
Even with the K-7? I think it's more sensitive to low-contrast targets. But there's not much solution I can see. The only thing is to try the best glass you can with good contrast wide open, do not use TC, etc. That way the AF can perform better. You can also help the AF a little if your lens supports Quick-Shift, you can manually focus by eye close enough then let the AF do the final adjustment.