Carl Zeiss Hologon T* 8/16 Contax G

Carl Zeiss Hologon T* 16mm f/8 Contax G, M-converted

The Carl Zeiss Hologon T* 16mm f/8, officially marked as the Hologon T* 8/16, is an ultra-wide-angle lens originally made for the Contax G system. In native form it is a Contax G lens, but it has become relevant to Leica collectors because the 16mm Hologon is one of the few Contax G lenses commonly converted to Leica M mount. The M-converted version belongs in LeicaLensList as a converted Leica-compatible rangefinder lens, while an unconverted Contax G example should not be treated as a native Leica M or L39 lens [1] [3].

Zeiss’ data sheet lists the lens as a 16.5mm fixed-aperture f/8 design with 5 elements in 3 groups, a 24 x 36mm image format, Contax G mount, a special bayonet connection for the Contax gradation filter, infinity to 0.3m focusing, 53mm diameter, 11mm external length and 120g weight. It was supplied with a dedicated external finder and a center / gradation filter to reduce edge fall-off, both of which are important collector accessories [1] [2].

The Hologon T* 8/16 is distinct from the earlier Zeiss Hologon 15mm f/8 made for the Zeiss Ikon Hologon Ultrawide camera and from the limited Leica M-mount 15mm Hologon. The Contax G 16mm version used a different 5-element optical formula and should not be merged with the 15mm Hologon entries. Converted Leica M examples are generally scale-focus lenses, not rangefinder-coupled lenses, and the quality of the conversion is a major collector and usability factor [3] [4].

Optical qualities

Rendering
The Hologon T* 16mm f/8 is known for an extremely wide, rectilinear rendering style with very low geometric distortion. Zeiss described the design as virtually distortion-free, and modern testing of M-converted examples continues to identify low distortion as one of its defining characteristics [1] [3].

Vignetting and center filter
Strong natural light fall-off is part of the lens design. Zeiss supplied a Contax gradation / center filter to reduce this effect, and modern users often consider the filter an important accessory. On digital cameras, the center filter does not remove all practical issues because sensor angle, filter stack and color response can still produce strong vignetting or color cast [1] [3].

Digital use
Digital performance is highly camera-dependent. Phillip Reeve’s testing reports strong color cast on some Leica digital bodies, lower color cast on the Leica M11 than on some earlier bodies, and major differences between stock and thin-filter digital sensors. On film, color cast is not an issue, although vignetting remains part of the lens character [3].

Flare resistance
The lens uses Zeiss T* coating, but flare control should not be overstated. Modern testing notes that the bulbous optical design and extreme field of view can still lead to flare or reflections in difficult light, especially when using the center filter [3].

Distortion and aberrations
Low distortion is one of the strongest documented optical traits of the Hologon design. Modern testing also reports good chromatic aberration correction, while noting that heavy vignetting and digital color cast are more significant practical concerns than distortion [3].

History

Development and Launch

The Hologon name dates back to Zeiss ultra-wide designs of the 1960s, but the Contax G Hologon T* 8/16 was a later recomputed lens for the 1990s Contax G system. It was introduced with the Contax G era in 1994 and gave the system a compact fixed-aperture ultra-wide lens with a 105 to 106 degree diagonal angle of view [1] [2] [5].

Production Evolution

The Contax G Hologon T* 8/16 was produced in Contax G mount and is widely recorded as the only manual-focus lens in the Contax G lens lineup. Its official Zeiss catalog number is 10 49 27. JuzaPhoto lists production from 1994 to 2005, corresponding to the active Contax G period, although individual production-batch data and total production numbers are not consistently documented in public sources [1] [5].

Special Editions/Variants

No factory Leica M version of the 16mm Contax G Hologon is documented. Leica M examples are conversions from the original Contax G lens. This should not be confused with the earlier native Leica M 15mm Hologon, which is a separate lens with a different focal length and optical formula. Known collector-relevant forms are the original Contax G version, Leica M conversions, and rare custom LTM or other conversions that should be documented individually by conversion maker, mount accuracy and reversibility [3] [4] [6].

Collector Notes

Collectors should verify whether the lens is still native Contax G or has been converted to Leica M. For M-converted examples, check infinity calibration, mechanical clearance on film Leica M bodies, focus-lever modification, absence of rangefinder coupling, mount quality and whether the conversion is reversible. Original accessories are especially important: the dedicated 16mm viewfinder, center / gradation filter, caps, case and filter pouch materially affect collector completeness. The protruding rear optical section also requires careful compatibility checks before use on non-native cameras [2] [3] [4].

Special editions

No confirmed factory special edition is documented for the Carl Zeiss Hologon T* 16mm f/8 Contax G.

Known collector-relevant variants and related versions include:

• Original Contax G Hologon T* 8/16, catalog number 10 49 27.
• Leica M-converted Contax G Hologon 16mm f/8, suitable for LeicaLensList as a converted M-mount lens.
• Custom LTM / screw-mount conversions, rare and conversion-dependent, not factory standard.
• Earlier Zeiss Hologon 15mm f/8 for Leica M, separate lens, separate focal length and separate database entry.
• Zeiss Ikon Hologon Ultrawide 15mm f/8 fixed-camera lens, historically related but not the same lens.

Sources

• [1] Carl Zeiss. Hologon T 8/16 Data Sheet*. https://lens-club.ru/public/files/pdfs/55240021bbbc49677fdd187c317977ec.pdf
• [2] Contax / Kyocera. Contax G System Brochure. https://modusdever.com/assets/Manuais/contax/202000_brochure01.pdf
• [3] Phillip Reeve. Review: Contax-G 16mm 8.0 Hologon. https://phillipreeve.net/blog/review-contax-g-16mm-8-0-hologon/
• [4] 35mmc. Zeiss 16mm f/8 Hologon Lens Review, M-Mount Modified. https://www.35mmc.com/02/08/2015/zeiss-16mm-f8-hologon-review/
• [5] JuzaPhoto. Zeiss Hologon T 16mm f/8 Contax G, Specifications and Opinions*. https://www.juzaphoto.com/recensione.php?l=en&t=zeiss_hologon16_f8
• [6] Andy Shields. Wide-Eyed with the 16mm f8 Carl Zeiss Hologon. https://shieldsportfolio.com/articles/2023/4/18/wide-eyed-with-the-16mm-f8-carl-zeiss-hologon
• [7] MIR. For Leica M Cameras, Carl Zeiss Hologon 16mm f/8 Contax G. https://www.mir.com.my/rb/photography/companies/nikon/nikkoresources/RF-Nikkor/Contax_RF/Zeiss-Hologon/index4.htm