You asked

Is the pentax smc da 55mm f 1 4 sdm good for video?

The site doesn't review how this lens performs for video, so I can only judge it from its specs and our video guide. It's an autofocus prime with no stabilisation. On APS-C it frames like about 82mm on full frame, which is a tight view.

That makes it a better fit for interviews, talking-head shots, or footage where you want a soft background, than for vlogging. Our video guide recommends a wide lens for vlogging, because a tight view crops you in too far once stabilisation kicks in. If you plan to shoot yourself at arm's length, look for something wider. If you're filming people across a table, this lens could work well, as long as you also budget for sound, which the guide covers in its audio section.

For the lens itself, see the Pentax smc DA* 55mm f/1.4 SDM page.

Written by Claude from this site's pages.

From these pages