Jupiter-8 1: 2 F = 5cm P is a universal normal high-aperture lens for rangefinder small-format cameras such as "Sharp", "Mir" and "Kiev". Equipped with a 9-blade iris diaphragm.
Lens Jupiter-8 is a Soviet clone of Carl Zeiss Sonnar 2/50... Recalculated in 1948 for Soviet optics and produced in various frame options, but all for rangefinder cameras. I was surprised at what an interesting picture this glass gives. Real focal length -52,43mm, equipped with a 9-blade diaphragm.
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 obtained by the USSR as reparations. At the beginning of production at KMZ, it was marked as "ZK" - "Zonnar Krasnogorskiy".
The lens has largely eliminated chromatic and spherical aberration and field curvature. Lens for rangefinder (mirrorless) cameras only. This lens is installed on modern SLR and mirrorless cameras through the appropriate adapter. Read the article about adapters.
Known lens variants
- Carl Zeiss Sonnar 1: 2/5 cm - original German production
- Zonnar Krasnogorskiy - "ZK" 1: 2 F = 5cm P... The first experimental series of the lens is a copy of Carl Zeiss Sonnar. It is found both under Zorky-FED and under Kiev-Kontax, in different versions of the cases.
- Jupiter-8M 1: 2 F = 5cm M mount Contax RF for cameras "Kiev". Standard lens for cameras Kiev-2, Kiev-3, Kiev-4
- Jupiter-8 1: 2 F = 5cm P light with focusing drive. Regular lens of the camera Zorkiy-3M. Production Krasnogorsk.
- Jupiter-8 1: 2 F = 5cm P light with focusing ring. Regular lens of the camera Zorkiy-3. Production Krasnogorsk.
- Jupiter-8 2/50 in a light unpainted case. Production Krasnogorsk.
- Jupiter-8 2/50 in a black case. Production Krasnogorsk.
- Jupiter-8 2/50 in black case Made In USSR. Production Krasnogorsk.
On Sovietcams.com Jupiter-8 has 17 known modifications that differ in the design of the frame, enlightenment and marking.
- Jupiter-8 2/50 in a light unpainted case. Production Krasnogorsk.
- Jupiter-8 2/50 in a black case (example photo). Production Krasnogorsk.
- Jupiter-8 2/50 in a black Made In USSR case (example photo). Production Krasnogorsk.
Refers to lenses of later editions, dedicated to them this overview
Jupiter-8 1:2 F=5cm P specifications
Aperture: 1: 2
Focal length, mm: 50
Angular field of view, city .: 45
Linear field of view, mm: 43
Weight: 130 g
Format: 2,4×3,6 cm
Jupiter-8 1:2 F=5cm P lens scheme
The layout of the Jupiter-8 is different from the original Zeiss Sonnar f/2 layout. A little, but still different. In the design of the optics, heavy crowns, which have a high refractive index, characterized by large (more than 50) values of the average dispersion coefficient.
Jupiter-8 1:2 F=5cm P MTF
Specification resolution (center/edge): 30/14 lines/mm, however, it is slightly less on the MTF chart. In fact, the sharpness of the lens for photography is more than enough. True, an open aperture has a very large difference in sharpness from the center to the edge.
Thanks to the maximum aperture of f / 2, Jupiter-8 is fast. At the same time, it has a very low weight. Jupiter-8 has an older super-aperture brother Jupiter 3. Jupiter-3 and Jupiter-8 differ in the optics scheme, but have a common root - a body kit in the form of additional elements is assembled around a generalized triplet. The generalized triplet first appeared in 1916, and Ludwig Bertele's development of the Sonnar circuit was an improvement on the Ernostar lens circuit. Ernostar pioneered the f/1.8 aperture, which allowed shooting in places where flash could not be used. In the future, the main drawback of Ernostar was corrected in Sonnar. These lenses have more contrast and better image quality than their predecessor.
Overview of Jupiter-8 1: 2 F = 5cm P
Unlike later-release lenses, the barrel indicates that the lens is coated (П). The front ring has Jupiter-8 1: 2 F = 5cm П manufacturer's number and logo... Later, they abandoned such a long spelling, and began to simply label “Jupiter-8 2/50 manufacturer's number and logo» On older versions, the enlightenment is a deep blue tint. The Krasnogorsk versions were marked by year, and, as a rule, they even correspond to the numbers of the cameras on which they stood.
The minimum focusing distance is a little less than a meter on the scale. However, if you neglect the design, you can unscrew the locking screw, and further reduce the distance. The maximum aperture is f / 2, which will allow handheld photography at adequate shutter speeds in low light conditions without raising the ISO. By the way, at an open aperture, the lens gives off a veil. Veil, as an artistic technique, will help, for example, soften portraits, or give the frame a light airiness. Despite the veil, the lens is sharp and is sharp enough to be seen in full-sized images. Prior to this lens, I had encountered veiling only on faulty lenses, along with accompanying passengers, such as a drop in sharpness and a mass of chromatic aberrations.
Open bokeh is a separate song. Not yet an ode, but already a song. Circles in the out-of-focus area have brightly defined edges, and the bokeh itself has a soft texture until bright and dark areas alternate, or light sources appear in the frame. Multiple light sources merge and turn into scales. I understand why some people don't like Sonnar's drawing. You get tired of looking at such full-size photos a lot. This effect is less noticeable on film. When processing, it is better to reduce the sharpness to avoid the annoying effect in bokeh. 9 aperture blades draw polygons at f / 8.
The color of Jupiter-8 P is interesting, it has a film coating. The overall contrast is slightly underestimated with this optic. The same can be obtained, for example, from a number in post-processing, just by raising the black point.
Sharpness is best, of course, in the center. The closer to the edge, the worse the sharpness. The effect is visible to the naked eye at both f / 4 and f / 6.3. In general, even at f / 11 there is not enough sharpness around the edges. However, with the right background, the lens flaws make for an interesting vintage mix. This is not an annoying twisting of Helios, but a softening of the picture along the edge.
Manual lens control, aperture too. There is no preset or any automation mechanisms, because this is 1959 (for a lens with # 5949556). Very light lens in an aluminum body. The rotation of the aperture and focus rings will be smooth if the lens is serviced. The easiest way to get to the thread of the helicoid, it protrudes a little, if you remove the mounting ring from the bottom of the lens. And if you also unscrew the locking screw, then you can completely unscrew the lens. It is not so easy to get to the diaphragm ring without complete disassembly. You can improve the picture from the lens if you blacken the back of the body. Thus, reducing re-reflections and additional illumination from light areas of the case metal.
Use on modern cameras
Attention! A Jupiter-8 lens on a 1.5 crop will have an angle of view equal to 1.5x50 = 75 mm lens for a full frame, and an aperture equivalent of f / 3. The total is 75mm f / 3. The easiest way is to install Jupiter-8 through an adapter to a mirrorless camera such as Sony NEX or Sony a7. Read the article about adapters.
- Good image quality, sharpness and color
- 50mm - popular focal length for stock lens
- The lens is not afraid of frost and bad weather. It is made of metal and glass.
- Will fit on any digital camera except DSLRs.
- You can get a warm tube photo simply by shooting in BW + contrast or BW + yellow / red filter.
- Open diaphragm gives a strong veil effect, plus the body is not painted on the camera side. You can fix it by painting it black, or you can leave it that way and apply it as an artistic effect.
- Weak edge sharpness.
- Scales in bokeh. If there are light sources, then after the ninth to tenth frame when viewing it starts to enrage, as it distracts from the subject.
- Weak enlightenment. Areas exposed by light sources cannot be pulled out in post-processing. Well, it's not that a flaw - just a feature of the optics of the past.