Kase 150mm f/5.6 AF Reflex Mirror Lens (Canon EF) Review

The Kase 150mm f/5.6 AF Reflex Mirror Lens brings a rare feature to the Canon EF mount: autofocus in a compact mirror lens design. Reflex lenses are known for their signature donut-shaped bokeh and short physical length, making them appealing for telephoto work where portability matters. This lens retains those hallmarks while adding modern conveniences like an AF/MF switch, USB-C firmware updates, and support for magnetic filter systems. At 150mm with a fixed f/5.6 aperture, it occupies a niche between true portrait telephotos and longer wildlife glass, offering full-frame coverage in an aluminum alloy body.

The fixed aperture and 4.9-foot minimum focus distance are typical compromises for the reflex design, which uses mirrors instead of traditional glass elements to fold the light path. The 67mm filter thread and magnetic filter compatibility give you creative flexibility, though the donut bokeh will not suit every subject or taste. At $649, it sits in an unusual spot: more expensive than most manual reflex lenses but priced as a specialty tool rather than a mainstream telephoto. It is a lens for photographers who want the reflex look and compact form without giving up autofocus.