On 10/07/2011 2:11 PM, Sandman wrote:

So I have this Tamron 28-300 (which is 18-200 on a FX body, right?
Sorry if I get that backwards) which is a fine enough lens, but it
goes from f3.5 - f6.3. It's not a huge lens by any stretch.

It would be 28~300mm on the FX body, on a DX (APS-C) it acts like a
42~450mm. They could make it a straight 28~300/2.8 constant. It would
need a 120mm lenscap, and would weigh around 3-4 kg 6-10 lbs.