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Messages - BBYosh2012

#1
Hardware and Accessories / Re: Lenses for 550d
August 26, 2012, 06:03:31 PM
Quote from: Francis on July 03, 2012, 06:53:52 PM
The better the AF motor, the better the performance of the follow focus-related ML features. My Sigma 24-70 has a clunky motor with jerky motion when using focus pulling and the like.

I'm using v2.3 with my T2i.

I have one problem though. Follow focus and rack focus work perfectly with my Canon 18-55mm lens (which I don't like to use for video) but not with the Sigma 24-70mm f2.8 lens(which I really like to use).

According to the Focus End Point counter the pulses are being sent to the lens but the lens only responds intermittently and unpredictably. Start and end points are therefore not accurately recorded so Rack Focus is unpredictable. With a fresh, fully charged battery I've tried every combination of settings for Step size, Wait, Step Delay and Rack Delay but it makes no difference. It's obviously something about the lens. Does anybody have any suggestions for a work around?