Carl Zeiss Sonnar T* 85mm f/2 ZM

Carl Zeiss Sonnar T* 85mm f/2 ZM

Among the thirteen lenses Zeiss released in its M-mount ZM line, the Sonnar T* 85mm f/2 stands out as a rarity. It was one of only two ZM lenses built in Germany rather than by Cosina in Japan, the other being the Distagon 15mm f/2.8, and its complexity is the reason it stayed in Oberkochen rather than going to the Japanese production line [1]. Estimates often cite a production run of around 600 units, a figure widely repeated but never confirmed by Zeiss, which has made the lens an unusually scarce object on the used market [1][2].

The optical layout uses six elements in six groups and was described by Zeiss as the first M-mount telephoto with floating elements, drawing on the company's cine lens experience and paired with a nonlinear rangefinder coupling mechanism [1][2]. Despite the Sonnar name and the close attention to wide-open performance, it is not an apochromatic design like Leica's APO-Summicron 90mm [1]. The barrel is all metal with a smooth focus ring, an aperture ring running from f/2 to f/16 in half stops, ten aperture blades, a 58mm non-rotating front filter thread, and a minimum focus distance of one meter [2]. It is rangefinder coupled and couples on Leica M bodies, and reviewers note it balances well on cameras such as the M9 and M Typ 240 despite its unusual shape [2]. The lens hood (Zeiss part number 1365-668) was an optional accessory sold separately rather than included [1][2].

The lens was assigned product number 1355 732 and shipped only in black [2]. It was announced alongside the Zeiss Ikon rangefinder at Photokina in 2004, but manufacturing difficulties tied to its floating-element design caused repeated delays, so deliveries did not begin until 2007, and it was quietly discontinued in 2011 [1][2]. Both the optical and mechanical assemblies proved hard to produce even for Zeiss in Germany [1]. A recurring reliability complaint among owners is the so-called Zeiss wobble, a play that can develop in the barrel and that has often required return to Zeiss for repair [2].

Optical qualities

Rendering The Sonnar 85mm f/2 is documented as a high-resolution lens with strong sharpness and micro contrast, to the point that it is sometimes called one of the highest-resolving M-mount lenses, though this comes with notable chromatic aberration [1]. Performance can be brilliantly sharp wide open when focus is placed precisely, and it tightens further at f/4 to f/8 [2]. Its character is a high-resolving, contrasty draw rather than a soft classic Sonnar look [1].

Bokeh and transitions At f/2 to f/4 the lens has a recognizable signature, but reviewers describe its background blur as inconsistent and at times messy, with a more two-dimensional rendering than some comparable Zeiss portrait lenses [1][2]. Wide open at close range the plane of focus is very shallow [1].

Aberrations Chromatic aberration is the lens's main weakness. Blue or purple fringing appears in backlit and high-contrast situations and near defocused highlights wide open, and it diminishes when stopped down to about f/2.8 [1][2].

Distortion and vignetting The lens shows a fair amount of vignetting wide open that largely clears by f/4 [1]. Because the telephoto design sends light to the sensor at near right angles, it avoids the color shift and edge tinting seen with some wide rangefinder lenses on digital bodies [1].

History

Development and Launch Zeiss presented the Sonnar 85mm f/2 ZM together with the Zeiss Ikon camera as part of the new ZM system at Photokina in 2004 [1]. It was intended as a cornerstone fast telephoto for the range, with a launch price around 2,800 euros, only slightly below Leica's APO-Summicron 90mm ASPH [1]. After repeated postponements caused by the difficulty of manufacturing its floating-element optical system, the first units did not reach buyers until 2007 [1].

Production Evolution Unlike most ZM lenses, which were outsourced to Cosina in Japan, the 85mm was built at the Zeiss plant in Germany because of its optical and mechanical complexity [1]. It remained in the catalogue only a few years before being discontinued in 2011, reportedly affected by high price, production cost and production problems [2].

Special editions No major factory special editions, military versions or alternative finishes of the Sonnar 85mm f/2 ZM are widely documented; it was offered as a single black, M-mount version [2].

Collector Notes Identification points include the front ring engraving Carl Zeiss Sonnar T* 2/85, the product number 1355 732, and the 58mm non-rotating filter thread [2]. The optional hood (Zeiss 1365-668) is frequently missing, so its presence is worth confirming. Buyers should check the barrel for the Zeiss wobble, since several owners have had to send copies back to Zeiss for service [2]. The small reported production of roughly 600 units helps explain its scarcity and rising collector interest, though that quantity has never been officially confirmed [1][2].

Sources

• [1] Macfilos (Jörg-Peter Rau). The M Files (30) Zeiss Sonnar 85/2 ZM – one of the rarest M-Mount lenses ever made. https://www.macfilos.com/2026/05/13/the-m-files-30-zeiss-sonnar-85-2-zm-one-of-the-rarest-m-mount-lenses-ever-made
• [2] Pebble Place. REVIEW | Zeiss 85mm F2 Sonnar ZM. https://www.pebbleplace.com/reviews/rangefinder/zeiss_85mm_sonnar/index.html