Is the tamron sp af 17 50mm f 2 8 xr di ii ld aspherical if good for landscape?

It's a fair landscape lens, but not a great one. On APS-C, 17mm is about 26mm full frame, which is short of the wide view the landscape guide recommends for big skies, and 50mm is too short for distant ridges. The f/2.8 maximum is also more than landscapes need, since you'll usually shoot at f/8 to f/11, and the lens is heavier than an f/4 zoom. If you already own it, it will do the job for general scenes and travel. If you're buying for landscapes, look for a wider APS-C zoom, as described in the landscape guide. On a full-frame body such as the Pentax K-1 Mark II, it works only in APS-C crop mode, at fewer megapixels.

Written by Claude from this site's pages.