SUMMARY
Christopher Frost tested the Kase 150mm f/5.6 autofocus mirror lens on a Sony a7CR, evaluating its ability to balance size, cost, and autofocus. Mirror lenses are typically manual focus with image quality trade-offs, but Kase aims to include autofocus. The lens's autofocus is functional but slow and audible, making it unsuitable for fast action. It features a metal build, weather sealing, and firmware update capability via USB-C. The lens supports Kase's magnetic filter system. Image quality analysis revealed issues with flaring, but the distinctive donut-shaped bokeh is a notable feature at this focal length.
TAKEAWAYS
The Kase 150mm f/5.6 autofocus mirror lens aims for a balance of size, cost, and autofocus.
Autofocus is functional but slow and audible, not ideal for fast-paced photography.
The lens offers unique donut-shaped bokeh highlights at 150mm.
Build quality is solid for its $650 price, but flaring remains a significant issue.