Kase 150mm f/5.6 AF Reflex Review

The Kase 150mm f/5.6 AF Reflex is a compact mirror lens that brings autofocus to the traditionally manual-focus reflex category. At $649, it occupies an interesting niche for shooters who want a lightweight telephoto option without the bulk and cost of traditional glass. The aluminum alloy body keeps weight down, and the 1.5-meter minimum focus distance makes it versatile enough for portraits, wildlife, and travel work where portability matters more than absolute optical perfection.

Reflex lenses trade some image quality for size and weight, and this one is no exception. The f/5.6 maximum aperture is slower than most conventional telephotos, which limits low-light performance and depth of field control. You'll also get the characteristic donut-shaped bokeh that mirror lenses produce, which some find distracting. But for creators who prioritize packability and need a longer reach without carrying a heavy lens, the autofocus capability and solid build make this a practical choice.