With the V1, in the long end of the 30-110 and in lower lighting conditions, the AF acquisition speed is definitely a bit slower. The long end is something like a f5.6. So you really need tons of light to get the most out of the long end. That being said, during the skate boarding photo day, I was using the 30-110 exclusively and did not feel that the AF acquisition speed was lacking at all. I thought it was every bit as fast as my pro-sumer K5 with a prime lens (FA35/2). That was of course in good lighting conditions.