Helios

Helios (Гелиос) was a type of camera lenses, made in the USSR by a range of lens manufacturers such as KMZ, MMZ and Valdai. They were usually supplied with Zenit SLR cameras and thus usable with other M42 lens mount cameras. 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 is 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	LTM	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	LTM, 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