Telephoto/Portrait Lens. With a 35mm-equivalent focal length of 156mm after the sensor crop-factor, the Pentax 200mm f/4 is a great choice for portrait use in and out of the studio. It offers a tighter angle of view than its brother, the Pentax SMC-FA 645 150mm f/2.8 IF, but at the expense of a slightly slower f/4 aperture.

Internal Focusing. The internal-focusing 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. Two extra-low dispersion elements correct for any chromatic aberration, while a ghostless coating eliminates reflections to maximize contrast.

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.