Thypoch Simera 21mm f/1.4 ASPH Ultra-Wide Full-Frame Manual Prime Lens - Leica M / Black

The Thypoch Simera 21mm f/1.4 is a fully mechanical ultra-wide prime for full-frame Leica M-mount rangefinders, pairing a genuinely fast f/1.4 aperture with a near-90-degree diagonal field of view. That combination is rare at this focal length: most 21mm rangefinder lenses give up light-gathering to stay compact, while the Simera 21mm holds f/1.4 wide open and still weighs only about 428g, making it the lightest lens in its class. For landscape, architecture, astrophotography, environmental portraiture, and cinematic street work, it delivers sweeping perspective and low-light capability in a package that stays comfortable on an M body all day.

Optically, the lens is built around 13 elements in 11 groups, including 2 aspherical, 3 ED (extra-low dispersion), and 3 high-refractive-index elements, supported by a floating lens group that keeps chromatic aberration and distortion in check even at maximum aperture. The result is edge-to-edge sharpness that holds up on 60MP sensors, with clean rendering and controlled color fringing wide open. The precision-polished aspherical surfaces are specifically engineered to avoid the 'onion ring' and 'donut' bokeh artifacts common to cheaper aspherical designs, so out-of-focus highlights stay smooth and natural.

Handling is where the Simera 21mm separates itself. A 14-blade cinema-grade diaphragm keeps the aperture round through the f/1.4 to f/16 range for beautifully circular bokeh, and the aperture ring can be de-clicked for silent, stepless adjustment when shooting video. Focus is manual with a machined full-metal barrel, rangefinder-coupled with a tactile resistance point at 0.7m, and it continues down to a remarkably close 0.23m minimum focus distance for a wide-angle M lens, opening up dramatic close-up perspectives. A purpose-designed ultra-wide lens hood mounts and folds quickly. Native Leica M mount also adapts cleanly to Sony E, Canon RF, Nikon Z, and Fujifilm mirrorless bodies with a standard M adapter, making this a versatile manual-focus wide angle for rangefinder and mirrorless shooters alike.

Features

• Fast f/1.4 maximum aperture at an ultra-wide 21mm focal length - excellent low-light and astrophotography performance
• Near-90-degree diagonal field of view for landscapes, architecture, interiors, and cinematic street photography
• 13 elements in 11 groups with 2 aspherical, 3 ED, and 3 high-refractive-index elements plus a floating lens group for minimal chromatic aberration and distortion wide open
• Edge-to-edge sharpness that resolves fine detail on high-resolution sensors up to 60MP
• 14-blade cinema-grade rounded diaphragm for smooth, circular bokeh free of 'onion ring' and 'donut' artifacts
• De-clickable aperture ring for silent, stepless exposure control when shooting video
• Close 0.23m minimum focus distance - unusually near for an ultra-wide M-mount lens
• Rangefinder-coupled manual focus with a tactile resistance point at 0.7m
• Lightweight full-metal body at approximately 428g - the lightest in its category
• Native Leica M mount; adaptable to Sony E, Canon RF, Nikon Z, and Fujifilm X mirrorless via an M adapter
• Purpose-designed ultra-wide lens hood with quick mounting and folding
• 62mm front filter thread for standard ND, polarizing, and protective filters

Technical Specifications

• Focal Length: 21mm
• Maximum Aperture: f/1.4
• Minimum Aperture: f/16
• Lens Mount: Leica M (rangefinder coupled)
• Format Compatibility: Full-Frame
• Optical Design: 13 elements in 11 groups (2 aspherical, 3 ED, 3 high-refractive-index) with floating lens group
• Diaphragm Blades: 14, rounded (de-clickable aperture ring)
• Angle of View: 90 degrees diagonal / 80 degrees horizontal / 58 degrees vertical
• Minimum Focus Distance: 0.23 m (9 in)
• Focus Type: Manual focus; rangefinder coupling with tactile resistance point at 0.7 m
• Filter Thread: 62mm
• Maximum Diameter: 66mm
• Length: 69.4mm (2.73 in) without hood; 78.6mm (3.09 in) with hood
• Weight: Approx. 428 g (0.94 lb)
• Construction: Full-metal body; fully mechanical, no electronic contacts

What's Included

• Thypoch Simera 21mm f/1.4 ASPH Lens
• Lens Hood
• Front Lens Cap
• Lens Hood Front Cap
• Rear Lens Cap