I Took the tape off the tc and the lens AF'd sweetly as you would expect as it is still only f5.6.So what exactly causes this hunting ?
I have always assumed that the occasional hunting when using say a 1.4 taped tc on a non series 1 camera and f5.6 lens was due to the fact that you are pushing the cameras AF sytem by trying to AF at f8 when the camera what not designed for it. But now I am not so sure as I recently put my taped 1.4 tc on a 70-200 f4 lens and it hunted like mad I Took the tape off the tc and the lens AF'd sweetly as you would expect as it is still only f5.6.
So what exactly causes this hunting ?
i think its to do with the light when your at f8 but when at f5.6 with the tape on the camera is NOT getting the info on what lens/ apeture is on so henc the hunting.
Rob.
I'm not sure what the cause of this is but have had similar experiences... I use a 1.4x (with pins taped) on my Sigma 500 f4.5, it works very well and almost never hunts. However when I put the tc on a Sigma 100-300 f4 it hunted wildly, when I took the tape of it worked fine. I did wonder why, so I hope someone comes up with the answer.