You asked
Is the panasonic lumix g 45 200mm f 4 5 6 ii good for travel?
Not as a standalone travel lens. The 45-200mm zoom is a telephoto. On Micro Four Thirds it frames like 90-400mm on full frame, and the travel guide asks for a zoom that starts around 24-105mm in full-frame terms so you can cover wide streets and food as well as distant details. This one starts at 90mm equivalent, so you'd miss most of the wide shots.
It has real strengths for travel, though. It's stabilised, which helps when you're handheld in a dim church, and it's small for a telephoto. It's a good second lens for wildlife, markets seen from afar, or sights you can't walk close to. Its f/4-5.6 aperture gets darker as you zoom in, so 200mm indoors will be hard going.
If you want one lens for the trip, pair a wider zoom with it, or choose a one-camera setup from the travel picks. The lens fits many Micro Four Thirds bodies, including the Olympus OM-D E-M10 Mark IV and the Panasonic Lumix GX85, so you can build a light kit around it.
Written by Claude from this site's pages.