Hi. I' m here to decide what set of lenses could be my ideal solution for travel, cosidering hi IQ and convenience too. A single zoom lens would be very easy to carry on, but a 2 lenses set will be nice too for my needs, no problem. So, I was wandering about IQ. I know Tamron 17 -50 has a great reputation, and the focal range will cover all my needs. I know 17mm on dx is not that wide, but for my needs is wide enough. I know Sigma 24-60 2.8 ( discontinued) is a great zoom too, and I could fill the gap on the wide end adding a Tokina 17 3.5 SL ( AIS type) prime lens. I' ve heard this Tokina has very low distortion and great sharpness stopped down at 5.6 , so it could be great for landcapes and buildings, where distortion is critical. I know , on the other end, that tamron 17-50 shows a significant distortion from 17 to 24 mm, and this is not desiderable for scapes and more worse for buildings. But I know that shooting RAW and working on PS perspective and distortion correction could fix nicely the problem. Which solution do you suggest for my needs, the Tamron 17-50 or the sigma 24-60 2.8 + tokina 17 3.5 ? I also know these 2 latter lenses are full frame...Thank you very much. Marco.