Helios 40-2 85mm f/1.5
The Helios 40-2 85mm f/1.5 is a 85mm f/1.5 manual-focus lens for the M42 mount, made by Helios from 1970s-present. It uses 6 elements / 4 groups, Biotar-type Double Gauss. Typical used value is $90 to $350, with most examples near $170, and it adapts to Sony E, Fuji X, MFT, Canon RF, Nikon Z, and L-mount with a plain mechanical adapter.
Helios 40-2 85mm f/1.5 specifications
Helios 40-2 85mm f/1.5 specifications
Why collectors want it
A fast portrait lens derived from the Zeiss Biotar 75mm f/1.5, reissued by Zenit into the 2010s. At f/1.5 it produces strong swirly bokeh and a soft glowing rendering that collectors prize for portraits. It is large and heavy with a preset aperture ring on most versions.
Mount and adapters for the 40-2 85mm f/1.5
The Helios 40-2 85mm f/1.5 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 Helios 40-2 85mm f/1.5?
The Helios 40-2 85mm f/1.5 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 Helios 40-2 85mm f/1.5 worth in 2026?
A used Helios 40-2 85mm f/1.5 typically sells for $90 to $350, with most clean working examples near $170. Basis: eBay sold listings, 2024-2025; new-old-stock Zenit reissues sit at the high end. This is an estimate, not an appraisal; condition, variant, and service history move the number.
Does the Helios 40-2 85mm f/1.5 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 Helios 40-2 85mm f/1.5 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 Helios 40-2 85mm f/1.5 made?
Helios made the 40-2 85mm f/1.5 from 1970s-present. That puts the Helios 40-2 85mm f/1.5 21 years 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 Helios 40-2 85mm f/1.5?
The Helios 40-2 85mm f/1.5 uses 6 elements / 4 groups, Biotar-type Double Gauss. Double Gauss designs are near-symmetrical six- or seven-element formulas that support fast apertures with good correction; fast versions show glow from spherical aberration and swirl from mechanical vignetting wide open.
Which lenses are similar to the Helios 40-2 85mm f/1.5?
Close alternatives in the same focal class are 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. (85mm f/1.8, $100 to $340), and the KMZ Jupiter-9 85mm f/2 (85mm f/2, $90 to $320). The KMZ Jupiter-9 85mm f/2 costs less on the used market. The Carl Zeiss Planar T* 85mm f/1.4 (C/Y) is faster.
Alternatives to the 40-2 85mm f/1.5
Lenses within 15mm of 85mm from other makers, ranked by how close they sit in focal length, aperture, and price.
Where this lens fits
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Terms this lens demonstrates
Related guides
- Swirly bokehWhat causes swirly bokeh, why Biotar-type lenses like the Helios 44-2 produce it, how sensor size and aperture change it, and which vintage lenses swirl the most.
- 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.