Canon C70 with Kipon B4 to PL adapter and Canon HJ Cinema Lenses

VND PL adapter: specifications and geometry

The drop-in filter delivers 1.5 to 7 stops of attenuation. A multi-start threaded mechanism handles back-focus adjustment at the PL flange. KIPON claims premium optical quality and color accuracy for the Japanese-made VND element. That language reads as marketing until transmission curves and color shift are measured at both endpoints of the range.

Comparable drop-in VND options — MOFAGE POCO, Breakthrough Photography Cinema DFM — cover similar attenuation ranges. The KIPON differentiator is geometry. The VND block sits as deep as possible inside the adapter body, maximizing clearance for PL lenses with protruding rear optical groups. KIPON confirms compatibility with its own Mamiya 645-PL 0.7x optical focal reducer, a configuration that stacks a speedbooster with rear filtration and preserves the medium-format rendering Mamiya glass is known for.

Pre-order is open on the manufacturer's site. Standalone pricing is $699, with a 15% discount bundled with the 0.7x Pro Lock Adapter for Mamiya 645 lenses.

C70 + B4-to-PL + HJ: what the source confirms

The YouTube upload is titled with the three components — Canon C70, Kipon B4-to-PL adapter, Canon HJ cinema lenses — but the available material offers no measured performance data. Resolution retention across the B4-to-PL optical path, flange tolerance under thermal drift, and any additional crop factor beyond the C70's Super 35 sensor window are all unverified. Treat the upload as proof the combination physically mounts and functions, not as a test report.

Bench checklist before committing

• VND transmission curve across the full 1.5–7 stop range. Color cast typically drifts at the dense end; check both endpoints and the midpoint.

• Flange distance lock torque and repeatability on the multi-start thread. A repeatable lock is mandatory for any prime lens that relies on a calibrated rear gap.

• Physical clearance between your heaviest PL lens's rear element and the adapter's recessed filter face. Measure from the PL flange to the deepest protrusion of the rear group.

• B4-to-PL on the C70: resolve a standard 4K chart at center and corners, verify iris data passes through to the camera body, and confirm the C70's RF flange depth does not bottom out against the adapter rear before the locking ring seats.