Originally posted by madisonphotogrl I am surprized you wouldn't try the Pentax 50-200mm. Not long enough for you or does it not have good reviews? I was considering that lens.
The 50-200 is a very good lens for the money. Lots of happy owners out there and very few complaints. I had one for a few months bt sold mine when a Sigma 70-200 f2.8 became available. The Pentax is light and has good IQ. Decently sharp with the Pentax quick shift (nice feature) but it has no Macro ability.
The lens in this thread can be had around the same price range (or fairly close) and is a similar speed. So many have gone this route because it's only 20mm longer in the short end and 100mm longer at the long end (a big difference). Plus the 1:2 macro is a great feature (not available with the Pentax). So it's a very good all round lens.