The Pentax SMC-FA 645 150mm f/2.8 IF is a legacy portrait- and telephoto-length lens that’s compatible with the Pentax 645Z. Key features include:
Excellent for portraiture
Shallow depth of field and good low-light performance
Advanced optical design for high-quality images
Portrait-Length Lens. With a 35mm focal length equivalent to 117mm after the sensor crop factor, the Pentax 150mm f/2.8 is a great choice for portrait use in and out of the studio. The fast f/2.8 aperture provides a very shallow depth of field and enables relatively low-light shooting.
Internal Focusing. The internal-focus design means the focusing group is much smaller and easier to move. Not only does this enable the lens barrel to stay in place while focusing, but it also increases focusing speed.
Please Note. This is a legacy lens that was originally designed for medium-format film cameras. We’ve noticed that it tends to slightly front- or back-focus, so you’ll want to make sure you microfocus adjust before you start shooting.