You asked
Is the tamron 14 150mm f 3 5 5 8 di iii good for travel?
Yes, it's a sensible travel lens, with one caveat. On Micro Four Thirds it frames like 28-300mm on full frame, so one lens covers wide street and interior shots through to distant details. That's exactly what the travel guide asks for: you won't be changing lenses on a crowded square.
The catch is that it isn't stabilised, and the aperture drops to f/5.8 at the long end. Choose a body with in-body stabilisation to make up for that in dim churches and interiors. The OM System OM-5 Mark II is one of the bodies it fits.
It's also discontinued, so you'll likely be buying used. Check the condition before you pack it. For more on focal lengths, see the lenses guide.
Written by Claude from this site's pages.