Tamron seems to have tele-converters that continue the mechanical AF connection through to the primary lens. That is, they permit the *lens* to mechanically autofocus, unlike the Nikon TC16A which moves its own optics to make the focus adjustment. This looks like a good system, but does anyone have any experience with the optics on the Tamron converters? I am thinking of using the 1.4x with my Nikon 300/4AF. I am hoping the image quality will be better than my TC16A. Any comments? #2: I noticed a (used) lens advertised I have never heard of. It is a Tokina 24-40/2.8 AT-X autofocus. It apparently is not a current series lens, so is not listed on Tokina's web site. This is a very nice pack age of focal lengths for me (90% of my photos are done with 24mm and 35mm lenses), and is a fixed 2.8 aperture. Any experience with this lens? don ferrario http://www.ferrario.com/don
