Monobod
('Phantom' of the forum!)
22/07/2008 01:01
Re: What To Do
You will still have a gap between 45 and 55 and a shorter reach than the 80-320.
Why not go for the 17-70 to bridge the gap in the most useful region. The Sigma is a fine lens in this range. The 70-80 gsp is probably less important.