You asked
Is the sony e 18 200mm f 3 5 6 3 oss good for landscape?
It's a reasonable choice for landscape, with one caveat. Landscape doesn't need a fast aperture, since you'll usually shoot between f/8 and f/11 anyway, so the f/3.5-6.3 range isn't a drawback. The 200mm end is also handy for picking out layers of hills or a lone tree on a distant ridge, as the landscape guide suggests.
Where it falls short is the wide end. On APS-C, 18mm is about 27mm full-frame equivalent, which is not very wide for big skies and strong foregrounds. If you shoot mostly wide scenes, pair it with a dedicated wide zoom.
If you want the same range for less weight and money, the Sony E 18-200mm f/3.5-6.3 OSS LE is a lighter, cheaper version. Check the full 18-200mm page for the APS-C bodies it fits.
Written by Claude from this site's pages.