I think you would probably run out of sufficient light to make the 28-300mm f/3.5-6.3 DL Aspherical auto focus with a 2x TC. That is asking a lot of AF in that situation. In fact, Sigma says my 100-300/4 will AF with the 1.4x but not with the 2x. I haven't tried the 2x to find out.
On Sunday 22 December 2002 02:37 am, Kevin Waterson wrote: > I have a Sigma 28-300 Aspherical IF and wondered if the auto-focus > would still work with this ? -- Ken Archer Canine Photography San Antonio, Texas "Business Is Going To The Dogs"
