I have one of the older model (A16N) Tamron SP 17-50mm f/2.8 for Nikon. I like the lens for its value even though it does have a flaw related to FLASH photography in TTL-BL mode. Lately, Tamron has announced update to this lens with a built-in AF motor.
- No screw drive hole for AF. AF motor is now built-in. This makes the lens compatible with Nikon D40, D40x, and the new D60 DSLR cameras.
- AF/MF switch. It is no longer needed to set the focus mode on camera. I doubt it can do focus override (typically only on AF-S lens) though.
- Smoother but much lower AF. I hope it can provide more precise auto-focus and the accurate distance information to the camera so the old problem can be avoided.
Keywords: 17-50, A16NII, auto focus, Lens, SP, Tamron, Tamron SP AF 17-50mm F/2.8 XR Di II