TTArtisan 50mm f/1.4 ASPH.

TTArtisan 50mm f/1.4 ASPH.

Released in 2020, this lens arrived as part of TTArtisan's push into affordable Leica M optics, offering a fast standard focal length at a fraction of the price of Leica's own f/1.4 designs [1][2]. Its optical layout is unusual for an inexpensive 50mm: a longer-focal-length double-Gauss section up front is paired with a rear group carrying high-dispersion and aspherical elements that apply additional correction, an approach reviewers have compared to the "speedbooster-like" rear groups in recent Cosina-built Voigtländer designs [3]. The ten-element, eight-group formula includes one double-sided aspherical element and one abnormal partial-dispersion element alongside eight high-refractive elements.

The barrel is built entirely of metal and glass, with an aluminium body, a ribbed manual-focus ring, and engraved, paint-filled markings whose typeface deliberately echoes classic Leica lenses. The thin front aperture ring runs from f/1.4 to f/16 with half-stop clicks, and the twelve straight blades are held in alignment so the opening stays close to circular. The lens is a fully mechanical, manual-focus design with no electronic contacts, so it passes no EXIF data and carries no six-bit coding. It is rangefinder-coupled, and a notable convenience is that the coupling can be recalibrated by the user with a supplied small screwdriver, allowing owners to match it precisely to their camera without sending it away.

The M-mount version is the original release and focuses to roughly 0.7 m; later mirrorless-native versions for systems such as Canon RF and Sony E added closer focusing at the cost of some added spherical aberration near the minimum distance. The M lens has been sold in black, under the model reference A09B [4]. No major factory special editions of the M-mount version are widely documented.

Optical qualities

Rendering Reviewers describe a lens with a deliberate split personality that depends on focus distance. It performs well across most of the frame at portrait and standard working distances of roughly 0.7 to 3 m, where it combines good central resolution with smooth falloff into blur, while wide-open performance toward infinity is soft due to abundant spherical aberration.

Sharpness At wide apertures in the close-to-medium range the central portion of the frame is good to very good, with softer edges, and stopping down to f/4 to f/5.6 brings sharpness across the frame. At infinity the lens is soft at f/1.4 but reaches very good to excellent edge-to-edge results once stopped down, making it usable for landscapes.

Bokeh and transitions From minimum focus to about 3 m the background blur is generally smooth and well regarded, with only minor onion-ring structure in specular highlights from the aspherical element; beyond roughly 3 m the rendering roughens, with bright, multicoloured outlines on highlights tied to residual spherical and chromatic aberration.

Contrast and color Contrast is moderate at wide apertures in the close-range sweet spot and becomes punchy when stopped down, with a slightly warm base color balance.

Aberrations Lateral chromatic aberration is well controlled, while longitudinal CA appears wide open as magenta-before and green-behind fringing typical of fast fifties; coma is high, making the lens a poor choice for astrophotography.

Flare resistance Flare control is the lens's main weakness, reflecting modest coatings: shooting into the sun wide open can produce a rainbow ring flare, which is largely eliminated by stopping down slightly.

Distortion and vignetting The lens shows mild to moderate pincushion distortion that is easily corrected in software and is rarely objectionable in everyday use.

History

Development and Launch TTArtisan, the brand of Shenzhen-based DJ-Optical, introduced the 50mm f/1.4 ASPH. in 2020, shortly after its 50mm f/0.95, positioning it as a more practical and affordable fast standard lens for Leica M cameras. At launch it was offered only in M mount, and reviewers tested it on bodies such as the Leica M10. It was widely framed as a low-cost alternative to Leica's Summilux-M 50mm f/1.4 ASPH.[5].

Collector Notes Because the lens carries no electronic contacts and no six-bit coding, M-camera users who want focal-length recording or in-camera profiles must select 50mm manually. The user-adjustable rangefinder coupling is a useful feature but means originality and calibration are worth checking on the used market, since owners may have re-shimmed the coupling themselves. The lens ships with a slip-on metal cap but no hood, so a 49 mm-thread or push-on accessory hood is a common addition; verifying the cap and any aftermarket hood is sensible before buying.