Originally posted by dreamnet so which one is My BEST choice ?
1. Sigma 17-70 / DA* 50-135
2. DA 21mm / DA* 50-135
3. Sigma 17-70 / DA 70 / DA 50-200
Actually what you have is really good too! The FA 50 is a great lens, especially for the price.
The 50-135 definitely has great IQ for a zoom, and would give you lots of classic portrait lengths in one go.
But it's huge (about half a pound heavier than your Sigma, and probably as long as the Sigma fully extended, but its length doesn't change), maybe a little intimidating to subjects, and doesn't focus as fast as a prime (mostly because of the SDM). And nothing focuses as fast as the DA 70 (except the DA 40), and it's tiny, so easier to maneuver.
So it depends on how you work, and how strong your arms are