If you want to travel simple with one lens only, the two best options IMHO are:
- DA18-135 mm WR, and
- DA18-250mm.
The DA18-135mm is available new, its price is now lower and it is WR.
Th DA18-250mm is no longer manufactured byt can be found easily on the marketplace (PF market place, Adorama (used), keh.com). It has a longer reach and the lens is very sturdy. The DA18-250mm is in fact teh Tamron 18-250mm. The lens is very well regarded across all brands among th the all-around lenses.
Another option is the Sifam 18-250mm HSM OS. The lens is heavier and has HSM. Both are negative points IMHO when you want to travel light and want reliability.
The main weakness of all these all-around zoom lenses is the low-light conditions. In my case, I have the DA18-250mm and I complement it with a fast prime when I travel. My fav fast prime is the VL Nokton 58mm f1.4
Hope that the comment will help.
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