You asked

Is the panasonic lumix g x 12 35mm f 2 8 ii good for landscape?

It's a solid standard zoom for landscapes, but not a wide one. On Micro Four Thirds, 12-35mm frames roughly like 24-70mm on full frame. That covers most scenes, but you won't get the big skies a wide zoom gives you.

Landscape work doesn't need f/2.8. You'll usually shoot between f/8 and f/11 for depth of field, so an f/4 zoom would do the same job for less weight and money. The stabilisation helps if you hand-hold in low light, though most landscape shooters use a tripod anyway.

If you want a wider view, check the lens types on the Landscape page first.

Written by Claude from this site's pages.

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