Difference between revisions of "Industar 61"
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| − | The '''Industar 61''' was produced at the [[FED]] factory in Kharkov, Ukraine. It is a "normal" lens for [[M39]] (Leica screw mount) and [[M42]] (Pentax screw mount), with a focal length from 52-55mm, depending on the production run. It has four elements in three groups and | + | The '''Industar 61''' was produced at the [[FED]] factory in Kharkov, Ukraine. It is a "normal" lens for [[M39]] (Leica screw mount) and [[M42]] (Pentax screw mount), with a focal length from 52-55mm, depending on the production run. It has four elements in three groups and a range of apertures from f/2.8 to f/22. The [[Diaphragm|iris]] may have between six and ten blades depending on the version of the lens. It is commonly found on rangefinders made by [[FED]] and [[Zorki]]. Its brand name [[Industar]] refers to the class of similar 4-element/3-group lens constructions of the whole [[Soviet Union|soviet]] photo-optical industry. |
The Industar 61 L/D is possibly the most highly regarded lens for Ukrainian [[Leica]] copies apart from the 35mm Jupiter-12. In an L/D or L/Z version of this lens, the L indicates that the lens has (slightly radioactive) Lanthanum in it, and D indicates M39 mount while Z indicates M42 mount. Most examples are multi-coated and are marked as such with MC. Some Industar 61 L/Z bear the logo of [[LZOS]], probably having been made by that company. | The Industar 61 L/D is possibly the most highly regarded lens for Ukrainian [[Leica]] copies apart from the 35mm Jupiter-12. In an L/D or L/Z version of this lens, the L indicates that the lens has (slightly radioactive) Lanthanum in it, and D indicates M39 mount while Z indicates M42 mount. Most examples are multi-coated and are marked as such with MC. Some Industar 61 L/Z bear the logo of [[LZOS]], probably having been made by that company. | ||
Revision as of 14:23, 19 November 2022
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The Industar 61 was produced at the FED factory in Kharkov, Ukraine. It is a "normal" lens for M39 (Leica screw mount) and M42 (Pentax screw mount), with a focal length from 52-55mm, depending on the production run. It has four elements in three groups and a range of apertures from f/2.8 to f/22. The iris may have between six and ten blades depending on the version of the lens. It is commonly found on rangefinders made by FED and Zorki. Its brand name Industar refers to the class of similar 4-element/3-group lens constructions of the whole soviet photo-optical industry.
The Industar 61 L/D is possibly the most highly regarded lens for Ukrainian Leica copies apart from the 35mm Jupiter-12. In an L/D or L/Z version of this lens, the L indicates that the lens has (slightly radioactive) Lanthanum in it, and D indicates M39 mount while Z indicates M42 mount. Most examples are multi-coated and are marked as such with MC. Some Industar 61 L/Z bear the logo of LZOS, probably having been made by that company.
Optical formula from OPAL database
Cистема-Индустар-61 f'=53 2w=46 1:2.8
КОНСТРУКТИВНЫЕ ПАРАМЕТРЫ ОПТИЧЕСКОЙ СИСТЕМЫ
N Радиусы Осевые Световые Марки Показатели преломления
пов. кривизны расст. высоты стекол
L= .589300 .434050 .656280
ВОЗДУХ
1 19.099 7.500 9.300 СТК9 1.742397 1.761307 1.738057
2 57.540 1.500 8.000 ВОЗДУХ
3 -80.170 1.600 8.000 Ф4 1.624200 1.647216 1.619252
4 16.106 3.800 7.400 ВОЗДУХ
5 84.140 1.500 7.600 ЛФ9 1.579999 1.600239 1.575648
6 19.099 7.000 7.700 СТК9 1.742397 1.761307 1.738057
7 -40.460 8.070 ВОЗДУХ
ПРЕДМЕТ: Удал. размер Y = -23.00000гр.мнсек S0= .000дптр от вх.зрачка
ИЗОБРАЖ: Близ. размер Y'= .00000 плоск. SI= .000мм от пл.Гаусса
ДИАФР. : ND= 4 плоскость SD= 2.0000 мм передн. апертура= 9.3000 мм
Links
- Matt Denton's Industar 61 L/D lens page
- Matt Denton's HOWTO on cleaning and lubing the I-61
- Servicing an Industar 61 L/D lens, at Pentax Manuals
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| An Industar 61 L/D (M39 mount) image by Michael Gatchell (Image rights) |
