The used Pentax SMC 645 FA 150-300mm f/5.6 ED IF for Medium Format is a legacy telephoto zoom lens that’s compatible with the Pentax 645Z. Key features include:

Telephoto Zoom. With a focal range equivalent to 118.5-237mm after sensor-crop factor, the 150-300mm f/5.6 is a high-quality lens that gives you telephoto reach with the convenience of a zoom. Its range makes it a great choice for slower-moving sports and wildlife photography.

Autofocus/Manual-Focus Clutch. The 150-300mm f/5.6 uses a clutch design to switch between autofocus and manual focus, giving you fast access to make minute manual focusing tweaks.

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.