Sirui's ultra-fast cinema prime for APS-C — the 55mm T1.2 Nightwalker for L-Mount video shooters.
The Sirui Nightwalker 55mm T1.2 is a cinema-oriented prime lens for APS-C L-Mount cameras. Part of Sirui's Nightwalker series designed for low-light video work, it provides an 82mm equivalent field of view with an ultra-fast T1.2 aperture. The T-stop rating reflects actual light transmission rather than the theoretical f-stop, important for consistent exposure in video.
Optical performance is designed for cinema rather than clinical stills sharpness. The T1.2 aperture delivers very shallow depth of field with a smooth, cinematic rendering. Sharpness is good in the centre wide open and improves when stopped down. The lens is optimised for minimal focus breathing — critical for video work where focus pulls should not change the field of view.
L-Mount for APS-C bodies like the Panasonic GH series via adapter or Sigma fp in crop mode. Filter thread is 67mm. Weight is approximately 560 grams. Build quality is cinema-grade with a geared focus ring for follow-focus systems, de-clicked aperture ring, and consistent 67mm front diameter across the Nightwalker set for easy lens swaps during shoots.
Available on the used market at moderate prices. Check for smooth geared focus ring and aperture operation. Primarily a video tool — stills photographers will find better options elsewhere. An excellent choice for indie filmmakers and video creators working on APS-C L-Mount bodies who want ultra-fast cinema primes without professional cinema lens prices.