Kase’s Ultra-Compact 150mm f/5.6 Reflex Lens Surfaces at CP+ With Autofocus

First images of a new Kase 150mm f/5.6 REFLEX (mirror) lens surfaced during CP+ coverage (published Feb 26–27, 2026). Mirrorlessrumors published the lead line, “Here we have the first images of the new Kase 150mm f/5.6 REFLEX autofocus lens for Sony E, Canon EF and Nikon Z. There will be also a manual focus RF mount version,” framing the hardware as a mirror-telephoto revival with an autofocus twist.

Mounting and autofocus claims vary by outlet but converge on a short list of mounts. Mirrorlessrumors and a consolidated user report list Sony E (FE), Canon EF and Nikon Z as mounts associated with autofocus, while several outlets explicitly note a manual-focus RF mount variant. CanonBuzz put that division bluntly: “EF mount to enable autofocus and RF mount which is manual focus only due to imposed Canon restrictions 🙁,” which, if accurate, ties RF limitations to platform rules rather than optical design choices.

The lens’s compactness is a recurring point in the coverage. Sonyalpharumors called it “truly unique” and wrote, “it is the most compact 150 mm lens I have ever seen.” The original CP+ report captured the same idea in descriptive terms: “The compact reflex design promises long focal length reach in a very small physical package,” positioning the Kase piece as a possible outlier among 150 mm telephotos for size and portability.

All sites that ran the images credited the same photographer chain: “Courtesy of FukuiAsobiWeb via LensCulinaris.” Multiple outlets including Mirrorlessrumors, CanonBuzz and Nikoneye cited that attribution while publishing the first images during the CP+ coverage window of Feb 26–27, 2026. Nikoneye’s short-form headline added a direct tease: “Coming soon is this autofocus REFLEX lens from Kase!”

Key technical details remain unreported in the imaging-based coverage and should be confirmed before treating mount and AF claims as final. Missing items include the optical formula and elements/groups, exact physical dimensions and weight to substantiate the “most compact” claim, filter thread size, minimum focus distance and maximum magnification, the specific autofocus mechanism and whether AF relies on in-body systems or a lens motor, and pricing or availability. I will seek Kase confirmation on the official mount list, which mounts will carry native autofocus, and whether the RF variant is manual by design or constrained by Canon platform rules.

So what this means for day-to-day shooting: a true 150 mm reflex lens that is as physically small as outlets suggest would change kit choices for travel and field work where reach without bulk matters, but expect classic mirror-lens tradeoffs - central obstruction and donut-style bokeh are typical of REFLEX designs and could affect portrait and close-background rendering. If Kase’s autofocus implementation on Sony E, Canon EF and Nikon Z holds up, the lens would offer fast reach for handheld or small-rig use; if AF is limited or adapter-dependent the practical workflow will skew toward manual focus shooting. Confirmation from Kase on mounts, AF mechanics and full specs will determine whether this is a compact curiosity or a useful modern reflex telephoto.