----- Original Message ----- From: "Herb Chong"
Subject: Re: Sigma 2.8 Zoom lens comments
i read about this "slow or useless AF performance in low light" on the *istD comment and i wonder every time what is really going on. i shoot a lot of waterfall shots with a 10 stop ND filter mounted. that gives me typically 8 second exposures at f11 or f13 at ISO 200. i set the camera to point select AF mode, choose a focus point, press the shutter release half way, it focuses and lock correctly (usually on the first try), and i take my picture. the 10 stop filter is mounted while i am doing this. it's almost impossible to see *anything* in the viewfinder except the readouts, yet the AF works and i get correctly focused images pretty much all the time.
I tend to shoot moving subjects with the istD. In low light I can do the focus better myself. I still do my landscapes on a 4x5. Every one is correctly focussed <G>.
William Robb
