Fred Miranda published his review of the Light Lens Lab 50mm f/1.9 Rigid ZS6 lens for Leica M-mount.
The Light Lens Lab 50mm f/1.9 Rigid-ZS6 is clearly not part of the modern “maximum correction” race. It occupies a unique space: a recreation of a classic design inspired by the Dallmeyer Super Six 2-inch f/1.9, translated into a modern M-mount lens with rangefinder coupling that prioritizes rendering and mood, embracing imperfection and character over technical perfection.
This becomes obvious in use. Wide open at f/1.9, it already delivers usable resolution while clearly revealing its distinctive rendering character. It is not soft in the traditional sense, but it carries a controlled glow, lower contrast, and a distinctive transition between in-focus and out-of-focus areas that defines its character. Technically, center resolution is very good at f/1.9, and by f/2.8 it enters a high-performance modern zone. Stopping down to f/4 brings it close to peak performance, with improved micro-contrast and more even sharpness across the frame.
Field curvature is particularly interesting. At close distances, it bends outward, at mid distances it flattens, and at longer distances it shifts inward. This dynamic behavior is not a flaw but part of the lens’s rendering structure, shaping subject separation and edge behavior depending on distance.
Distortion is essentially negligible and doesn’t even require correction. Flare resistance has a distinctly vintage character: veiling flare is well controlled, but ghosting can appear depending on angle and light intensity. The ghosting is mostly purple-blue rather than warm amber, though under certain lighting conditions it can shift toward amber as well. This variability in ghost color gives the flare behavior an unpredictable quality that, for some, may add to the lens’s character.
Chromatic aberration is well controlled for this type of design. Lateral CA is minimal, while axial CA is present but restrained for an f/1.9 lens. The Standard version shows very minor purple fringing and occasional green/magenta fringing in extreme high-contrast transitions. The Low Contrast version reduces axial CA further but increases spherical aberration and coma, adding more glow and lowering contrast. These are real optical differences, not just coating variations.
Optical vignetting is a defining trait. Despite controlled tonal falloff, it produces cat’s-eye highlights toward the edges, contributing to a subtle swirling bokeh signature. Highlight structure is clean near the center but becomes has distinct outlining toward the edges, creating a sense of motion and depth in out-of-focus areas. The lack of aspherical elements keeps highlights smooth and avoids “onion ring” artifacts.
Depending on the distance, the rendering changes noticeably. At certain mid-range setups with layered backgrounds, it can take on a painterly quality that modern corrected lenses struggle to reproduce. The Low Contrast version pushes this further toward a vintage character, amplifying coma and spherical aberration, while the Standard version retains more micro-contrast and clarity in the focus plane.
The 11-blade aperture produces 22-point sunstars when stopped down. Blade curvature makes them slightly irregular rather than symmetric. Sunstars are minimal from f/1.9 to f/8, become more defined at f/11–f/16, and grow more chaotic at f/22.
At 0.7m MFD, performance remains strong even wide open, with only minor gains when stopping down. Focus shift is present but minimal and not practically problematic.
Compared to the Leica 50mm f/2 Summicron-Rigid, the ZS6 renders warmer. The Leica has slightly better extreme corner performance, while the ZS6 is stronger in the center and mid-frame, with a more pronounced character. Against the Light Lens Lab 50mm f/2 Speed Panchro II, the SP II is more uniform and controlled, with rounder highlights and less swirl. The ZS6 is more expressive, with directional shaping and stronger spatial variation. Compared to the Light Lens Lab 50mm f/1.5 Z21, the ZS6 feels like a more compact evolution of that rendering style. It shares similar vignetting and separation but with better off-axis performance and more even curvature. It earned the nickname “Mini-Z21” for this reason.
Pros
Cons
In the end, the Light Lens Lab 50mm f/1.9 Rigid-ZS6 succeeds precisely because it does not try to behave like a modern lens. It embraces optical vignetting, field curvature, and classic aberrations as part of its identity rather than flaws to eliminate.
It is technically capable enough for serious use, yet intentionally imperfect in a way that gives it a distinct visual signature. It renders with mood, depth, and an artistic character closer to classic optical systems like the Dallmeyer Super Six 2-inch f/1.9, and it is refreshing to see these older design philosophies brought back to life rather than erased by modern correction.
In a market dominated by clinical correction, the Rigid ZS6 stands out by doing the opposite with clear intent.
Previous Fred Miranda reviews can be found here:
Light Lens Lab 35mm f/1.4 double aspherical AA 11873 lens for Leica M-mount review
