The new Kase 150mm f/5.6 AF reflex mirror lens for Z/G/E/EF mount is now available for pre-order. Here are the key specs & design:

• The Kase 150mm f/5.6 AF Reflex (mirror/catadioptric) lens is a compact, full-frame medium-telephoto prime that Kase Optics (primarily known for filters) launched in March 2026. It’s generating buzz as the world’s first autofocus mirror lens at this focal length – most reflex designs are manual-focus only and much longer (300mm+).
• Focal length & aperture: 150mm with a fixed f/5.6 aperture (no variable iris, typical for reflex lenses).
• Optical design: 5 elements in 4 groups using mirrors + glass for a catadioptric layout. This keeps it much smaller and lighter than a conventional 150mm prime.
• Minimum focus: 1.5 m.
• Filters & accessories: 67mm screw-in thread, compatible with magnetic filter systems, and includes a magnetic pinch lens cap (works even with a hood attached).
• Build: Aluminum alloy body with a grooved focus ring; compact and handheld-friendly.
• Very compact size for a 150mm telephoto.
• Signature “donut” bokeh – out-of-focus highlights render as bright rings with dark centers. This creates a dreamy, artistic, or vintage look.
• Autofocus & Mounts: It offers full AF with AF/MF switch (plus manual override). Availability varies by mount due to camera maker restrictions.

Additional information on the new lens can be found here and here:

Kase Optics officially released the 150mm f/5.6 reflex autofocus lens

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