Build quality: almost good
Filter thread: 49mm
Infrared Mark: yes
I mainly used this lens reversed with extension rings as a macro lens. It stops down to f/22 for an idea of depth of field, that's why.
reversed lens, ~60mm extension rings, external TTL flash bounced and diffused with a white paper
reversed lens, ~60mm extension rings, external TTL flash bounced and diffused with a white paper