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Jupiter-8 is made according to the Zonnar optical scheme. Converted in 1948 for Soviet optics and produced in various frame options, but all for rangefinder cameras.
Lens Jupiter-8 2/50 m39
A universal normal high-aperture lens for rangefinder small-format cameras such as “Zorki” and “Kiev”.
Equipped with an iris diaphragm. Aperture control: two-ring. Coated optics.
The Carl Zeiss Sonnar 1: 2/5 cm lens for Contax cameras was designed in the early 1930s by Ludwig Bertele. Documentation for many German lenses, along with the technology, materials and equipment for their production, were received by the USSR as reparations. At the beginning of production at KMZ, it was labeled “ZK” – “Zonnar Krasnogorskiy”.
The lens has largely eliminated chromatic and spherical aberration and field curvature.
Technical characteristics of Jupiter-8
Focal length: 52 mm (52.49 mm )
Relative aperture: 1: 2
Field of view: 45 °
Frame size: 24 × 36 mm
Number of lenses / groups: 6/3
Front vertex focal length: -49.60 mm
Rear vertex focal length: 27.75 mm
Distance from first to last surface: 31.74 mm Clear
diameter of first surface: ∅29.0 mm Clear
diameter of last surface: ∅22.0 mm
Resolution (0/10/20 mm ): 39/29/24 lines / mm
Resolution according to TU (center / field): 30/14 lines / mm
Light transmittance: 0.81
Geometric vignetting: 56%
Type of enlightenment: chemical, single-layer
Aperture scale limits: 1: 2–1: 22
Number of aperture blades: 9
Close focusing limit: 1 m
for Zorky-type cameras – 28.8 mm;
for Kiev-type cameras – 34.85 mm
lens with camera:
for Zorky-type cameras – M39 × 1
for Kiev-type cameras – internal bayonet
for screw-in attachments: SPM40.5 × 0.5
for slip -on attachments: ∅42 mm
length of lens with caps:
threaded version – 45 mm
bayonet version – 40 mm
largest frame diameter:
threaded version – 49 mm
bayonet version – 46 mm
threaded version – 130 g
bayonet version – 125 g
Year of development (Sonnar 1: 2/5 cm ): 1930–1932, Germany
original – Ludwig Bertele
recalculation – KMZ, M.D. Maltsev
Design: no data
Years of production at KMZ: since 1947
Years of production at the Arsenal plant of the bayonet version: from 1955–1956.
Lenses “Jupiter” on the portal
Known lens variants
- Carl Zeiss Sonnar 1: 2/5 cm – original German production
- Jupiter-8M bayonet for Kiev cameras
- Jupiter-8NB bayonet for Kiev cameras
- Zenitar-8 2013. Redesigned ZK 2/50 threaded (M39 × 1 / 28.8) folding lens.
Jupiter-8 2/50 m39 review
This particular instance went as a staff on Zorky-4. Easy. Cheap. Is yours. Silver unpainted body, ribbed focus and iris rings.
Focusing is carried out within the range from 1 meter to infinity, moreover, infinity should come after 20 meters. In practice, it has not yet been verified, since there is no mirrorless camera at hand. I used the lens on a Canon EOS, however, “macro is not for everyone.”
One feature of the lens was noticed during installation. It is inherent in all rangefinder lenses that we try to install on DSLR cameras. Since rangefinder lenses are designed for a focal length of 28.8mm, and SLR cameras have a larger range (Zenit-E, for example, and others like it – 45.5mm), the image plane shifts and the lens turns into a macro. At the same time, the focus ring has no sense to rotate to achieve sharpness. It adjusts the sharpness very closely. You have to focus by moving the camera.
Aperture 9 blades. The lens should paint relatively circular out-of-focus highlights from f / 4. I would love to try Jupiter-8 2/50 M39 in portrait photography. The maximum aperture is f / 22, the body has a DOF calculator. The lens can be set to sharpness using the calculator, and shoot with it, as they say, “from the waist” without looking through the viewfinder.
The aperture ring is made according to the same principle as for the Industar-50 lens, i.e. small and uncomfortable, plus the lubricant on the ring should be thinner than the focus ring, otherwise we are guaranteed to lose sharpness when adjusting the aperture. Aperture is a good value for a portrait lens, and accordingly, background blur should be similar. If you have any experience with this lens, please share its strengths and weaknesses in the comments.
Image quality Jupiter-8 2/50 m39
The lens fades with side or backlight, and objects are flooded with light and texture disappears. The best time to take photos with this lens is morning, cloudy day, evening. The sharpness is satisfactory, the color rendition is without distortion. There is a slight soft effect on open aperture. The soft effect is enhanced when shooting on a sunny day. This is most likely a loss of sharpness. The lens, although it has enlightened optics, greatly loses contrast when exposed to light.
Body, build quality
The lens barrel is colorless, metallic. The body is aluminum, there are steel elements in the structure. Connecting thread for rangefinder cameras, М39х1. The lens has a slightly protruding rear. I will not dare to install this lens on a full-frame DSLR, even as a macro. But on Canon EF-s cameras, you can easily install it without any fears.
Use on digital cameras
Jupiter-8 2/50 m39 will easily mount on mirrorless cameras such as Sony NEX, Canon EOS M, through the appropriate adapter. At the same time, the lens will have an angle of view equal to the equivalent of an 80mm lens for a full-frame camera due to the crop factor of the APS-C matrices. On DSLRs, it is possible to use Jupiter-8 as a macro lens, since the focal length of rangefinder cameras is smaller.
Inexpensive lens from rangefinder cameras. In the secondary market, there are copies worth 300-500 rubles, in excellent condition and with a camera.