Originally posted by Pentaxor honestly Lowell, I can understand Robin's predicament. carrying two bodies at the same time could be a solution but can be a problem at the same time, especially if you want to travel light or on the go. this is an issue for me as well. this is the same reason why I can't sell my 12-24 and still having second thoughts on getting the 8-16. the 24mm is just too important for me and switching lenses in between lenses is really a bother at such focal lengths. I just wished that Sigma could push it a bit further and make it an 8-24 zoom which would make it much more versatile. I believe Sigma did this because they had the 17-50 zoom lens to cover that up. but I cant carry 2 big zooms just to accommodate certain focal lengths.
the issue at wide angles is that high zoom ratios are very difficult to achieve, considering distortion and IQ. If you look the widest range is 2.4:1 with the tamron 10-24. sigma and pentax stick with 2:1 and there is a reason for it,
Yes an 8-24 or 8-30 woud be great, but I won't hold my breath for it.
as for travelling light, every one has a different opinion and definition of light.
When I travel usually I use a small shoulder bag, which can hold 2 lenses or one lens on a body. I have used this bag to go to prague, taking my 10-20, my 28-75 and my K135F2.5, and to paris where i took my 10-20, my 28-75 and my 85F1.4 (plus 1.7x AF TC),(my camera is in hand with the two spare lenses in my shoulder bag, along with spare batteries and memory chips)
For San Antonio, I took just my 10-20 on my K10D and the 28-75 on my *istD. One camera in hand one in the bag.
I use a different bag (back pack actually to go from point A to point B, and carry all the stuff properly, but out and about, I limit what I carry to a little shoulder bag. That is one of the issues with camera bags in general, I think every one needs 2 bags, one to gety stuff safely from A-B and one to carry a minimalist kit when you get to B. I too am interested in the new sigma lens a little, but it may make me re-think the entire range of lenses I have, or perhaps change the tammy 28-70 for something more appropriate to use along with the 8-16 if I go that route.