Well the reviews of course, of the PDZ seem to say "Buy me, I am a terrific all in one lens, quiet, reasonably fast focussing, not too heavy and a respectable price. Plus a few stops extra with IS."
At present if I decide to take all my kit with me it goes in a backpack. A bit sweaty for an all day job, so I tend to only take it, on a specific photo outing.
The 18-275 would mean one lens, one body. I mean it won't go in my shirt pocket but the better range
justifies that. But at 73 (age) will I justify the price and get my money's worth from it.
Review link
http://www.tamronlensreview.com/tamron18270pzdvcreview
Yesterday I went to Oxenhope specifically for the choo choo's. I mainly used the 17-55 kit lens. The 'nifty fifty' was not wide enough (although it is the best lens in my kit) the 300 was used a couple of times.
Inside the exhibition shed it was too dark for the kit lens without a tripod (which I managed to forget) this was where the LX3 came into it own.
The station itself and exhibition hall is free to visit. Sunday steam trains were every 3/4 hour. (2 alternate between Keighley and Oxenhope, stopping at stations between.