KMZ Jupiter-9 85mm f/2
The KMZ Jupiter-9 85mm f/2 is a 85mm f/2 manual-focus lens for the M42 mount, made by KMZ from 1950s-1980s. It uses 7 elements / 3 groups, Sonnar. Typical used value is $90 to $320, with most examples near $160, and it adapts to Sony E, Fuji X, MFT, Canon RF, Nikon Z, and L-mount with a plain mechanical adapter.
KMZ Jupiter-9 85mm f/2 specifications
Why collectors want it
A Sonnar-formula portrait lens copied from the Zeiss Sonnar 85mm f/2, with a 15-blade aperture that gives very round out-of-focus highlights. It is soft and glowing wide open and sharpens by f/4. Early silver KMZ examples are valued above later black ones.
Mount and adapters for the Jupiter-9 85mm f/2
The KMZ Jupiter-9 85mm f/2 has a native M42 mount. M42 is a 42mm x 1mm screw thread with a 45.46mm register, introduced in 1949 on the Contax S and later adopted by Praktica, Asahi Pentax, Fujica, Zenit, Yashica, and Chinon. Every mirrorless mount has a shorter register than 45.46mm, so a plain mechanical adapter puts the lens at its design distance and infinity focus is preserved. Plain threaded adapter, no optics. Lenses with an auto-diaphragm pin need either an Auto/Manual switch on the lens or an adapter with an inner flange that holds the pin in. Preset lenses such as the Helios 44-2 have no pin and work on any adapter.
| Camera system | Adapter | Infinity focus | Frames like | Guide |
|---|---|---|---|---|
| Sony E | Plain mechanical, 27.46mm | Yes | 85mm on full frame; 128mm on APS-C (1.5x) | M42 to Sony E |
| Fuji X | Plain mechanical, 27.76mm | Yes | 128mm on APS-C (1.5x) | M42 to Fuji X |
| MFT | Plain mechanical, 26.21mm | Yes | 170mm on Four Thirds (2x) | M42 to MFT |
| Canon RF | Plain mechanical, 25.46mm | Yes | 85mm on full frame; 136mm on APS-C (1.6x) | M42 to Canon RF |
| Nikon Z | Plain mechanical, 29.46mm | Yes | 85mm on full frame; 128mm on APS-C (1.5x) | M42 to Nikon Z |
| L-mount | Plain mechanical, 25.46mm | Yes | 85mm on full frame; 128mm on APS-C (1.5x) | M42 to L-mount |
Frequently asked
What mount is the KMZ Jupiter-9 85mm f/2?
The KMZ Jupiter-9 85mm f/2 has a native M42 mount. M42 is a 42mm x 1mm screw thread with a 45.46mm register, introduced in 1949 on the Contax S and later adopted by Praktica, Asahi Pentax, Fujica, Zenit, Yashica, and Chinon. With a plain mechanical adapter it fits Sony E, Fuji X, MFT, Canon RF, Nikon Z, and L-mount bodies and keeps infinity focus.
How much is the KMZ Jupiter-9 85mm f/2 worth in 2026?
A used KMZ Jupiter-9 85mm f/2 typically sells for $90 to $320, with most clean working examples near $160. Basis: eBay sold listings, 2024-2025; also sold in M39 rangefinder mount. This is an estimate, not an appraisal; condition, variant, and service history move the number.
Does the KMZ Jupiter-9 85mm f/2 work on Sony E, Fuji X, and MFT?
Yes. M42 has a 45.46mm register and every mirrorless mount is shorter (16mm to 20mm), so a simple M42 adapter reaches infinity with no optics. On a full-frame body the KMZ Jupiter-9 85mm f/2 frames as a 85mm lens; on APS-C (1.5x) it frames like a 128mm, on Canon APS-C (1.6x) like a 136mm, and on Micro Four Thirds (2x) like a 170mm. Plain threaded adapter, no optics. Lenses with an auto-diaphragm pin need either an Auto/Manual switch on the lens or an adapter with an inner flange that holds the pin in. Preset lenses such as the Helios 44-2 have no pin and work on any adapter.
When was the KMZ Jupiter-9 85mm f/2 made?
KMZ made the Jupiter-9 85mm f/2 from 1950s-1980s. That puts the KMZ Jupiter-9 85mm f/2 1 year into the life of the M42 mount, which appeared in 1949 on the Zeiss Ikon Contax S (Dresden).
What is the optical design of the KMZ Jupiter-9 85mm f/2?
The KMZ Jupiter-9 85mm f/2 uses 7 elements / 3 groups, Sonnar. Sonnar designs pack their elements into thick cemented groups with few air-to-glass surfaces, which gave high contrast before multi-coating and a smooth, low-contrast look wide open.
Which lenses are similar to the KMZ Jupiter-9 85mm f/2?
Close alternatives in the same focal class are the Canon FD 85mm f/1.8 S.S.C. (85mm f/1.8, $100 to $340), the Helios 40-2 85mm f/1.5 (85mm f/1.5, $90 to $350), and the Carl Zeiss Planar T* 85mm f/1.4 (C/Y) (85mm f/1.4, $500 to $1,400). The Canon FD 85mm f/1.8 S.S.C., The Helios 40-2 85mm f/1.5, and The Carl Zeiss Planar T* 85mm f/1.4 (C/Y) are faster.
Alternatives to the Jupiter-9 85mm f/2
Lenses within 15mm of 85mm from other makers, ranked by how close they sit in focal length, aperture, and price.
Where this lens fits
Appears in these lists
Terms this lens demonstrates
Related guides
- M42 to Sony EHow M42 screw-mount lenses work on Sony E cameras: the 27.46mm adapter, flanged versus flangeless rings, auto-aperture pins, camera settings, and the APS-C crop.
- Buying checklistA step-by-step checklist for buying used manual lenses: the flashlight test for fungus, haze, and separation, mechanical checks, seller language, grades, and mount traps.