Hi all - I have been contemplating the purchase of a sigma 50-500 lens - the only problem is it is heavy (around 4 pounds)  I usually shoot anything past 250 with my tripod but because it allows me to stay in the 70-150 range on the same lens I could keep it on instead of switching all the time.  Right now I use a 2.8 50mm - a 4.5 18-200 and a 75/300 so this will allow me to have a full spectrum.  The price is pretty fair - I was going to buy a 10-20 wide angle but I really do think I will get more use out of this now - as the wide angle would be more for messing around with.

Any thoughts?  I will be using it on a Sony alpha 700.

Attached is the best scale pic I could find - I can get the lens for around $1100 new Canadian