Is the pentax smc da 50 135mm f 2 8 ed if sdm worth it?

The Pentax smc DA* 50-135mm f/2.8 is worth it if you shoot Pentax K-mount on APS-C and want fast telephoto portraits or tight framing. On an APS-C body it frames like 75-202mm on full frame, and f/2.8 gives shallow depth of field, which suits headshots and subjects with a blurred background. It has autofocus but no stabilisation, so keep your shutter speed up.

If you mainly shoot landscapes, travel, or street, a wider lens will serve you better. For portraits, my view is that a longer lens is worth the size. See portraits for how focal length changes a face, and sensor sizes to check whether APS-C suits your work. You can compare other options for your mount in the gear catalogue, and the lens's compatible bodies are listed on its page.

Written by Claude from this site's pages.