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Helios (Гелиос) is a range of camera lenses made in the USSR by several makers including KMZ, MMZ and Valdai. They were made for use with Zenit SLR cameras. The earliest have an M39 mount (the same thread as the Leica mount, but with a different flange-film distance). Later lenses have an M42 mount, and can be used with many more cameras. Some of the M39 lenses were supplied with a 39-42mm step-up ring. Some later Helios models were built also for the Pentax K mount. The Helios-40 and Helios-44 and are derivatives of the Carl Zeiss Biotar optical formula; the Helios-44 has a strong aberration at the margins, resulting in a characteristic 'swirl' which is reminiscent of Petzval lenses.

Model Mount Focal Length Maximum Aperture Minimum Aperture
Helios-1 50mm ƒ/2.0
Helios-2 M42 45mm ƒ/2.0 ƒ/16
Helios-3 100mm ƒ/2.0
Helios-23 35mm ƒ/2.0
Helios-27 135mm ƒ/2.0
Helios-29 25mm ƒ/1.5
Helios-31 40mm ƒ/1.4
Helios-32 15mm ƒ/2.0
Helios-33 M28 35mm ƒ/2.0 ƒ/16
Helios-34 15mm ƒ/4.0
Helios-35 15mm ƒ/1.5
Helios-39 25mm ƒ/4.0
Helios-40 M39 85mm ƒ/1.5 ƒ/22
Helios-40-2 M42 85mm ƒ/1.5 ƒ/22
Helios-41 150mm ƒ/2.0
Helios-42 27mm ƒ/2.8
Helios-43 19mm ƒ/1.5
Helios-44 M39, M42, Pentax K 58mm ƒ/2.0 ƒ/16 – ƒ/22
Helios-49 75mm ƒ/1.5
Helios-50 100mm ƒ/1.5
Helios-51 200mm ƒ/1.5
Helios-52 150mm ƒ/1.5
Helios-53 M42 200mm ƒ/2.5 ƒ/16
Helios-54 135mm ƒ/2.0
Helios-55 200mm ƒ/2.5
Helios-57 9mm ƒ/3.5
Helios-58 10mm ƒ/1.6
Helios-61 80mm ƒ/2.5
Helios-62 29mm ƒ/1.8
Helios-64 44mm ƒ/1.8
Helios-65 M42 52mm ƒ/2.0 ƒ/22
Helios-66 10mm ƒ/3.5
Helios-67 200mm ƒ/1.5
Helios-68 200mm ƒ/1.5
Helios-70 M42, Pentax K 52mm ƒ/1.9 ƒ/16
Helios-76 35mm ƒ/2.0
Helios-77 75mm ƒ/2.0
Helios-77M M42, Pentax K 52mm ƒ/1.8 ƒ/16
Helios-77M-4 M42, Pentax K 50mm ƒ/1.8 ƒ/16
Helios-79 45mm ƒ/2.0
Helios-81 Nikon F 52mm ƒ/2.0 ƒ/16
Helios-85 M42 85mm ƒ/2.0 ƒ/16
Helios-88 M42 50mm ƒ/1.9 ƒ/16
Helios-89 30mm ƒ/1.9 ƒ/16
Helios-94 Contax-Kiev 50mm ƒ/1.8 ƒ/16
Helios-97 M42 52mm ƒ/2.0 ƒ/16
Helios-98 M42 28mm ƒ/2.8 ƒ/16
Helios-101 M42 52mm ƒ/1.8 ƒ/16
Helios-103 Contax-Kiev 53mm ƒ/1.8
Helios-107 M42 65mm ƒ/2.8 ƒ/22
Helios-113 M 40mm ƒ/1.8
Helios-123 50mm ƒ/1.4