Jupiter-11 received the Sonnar optical scheme, the starting point was the Carl Zeiss Sonnar 4/135 lens. Taking into account the peculiarities and differences of the domestic optical glass from the German, adjustments were made, the optical scheme was recalculated for our glass grade. It is worth noting that with such an optical scheme, the image quality is strongly influenced by the decentering and skewing of the lenses, which requires strict assembly standards.
Jupiter-11 lens specifications:
- The focal length is 133 mm.
- The maximum aperture is 4.
- The minimum aperture is 22.
- The number of lenses / groups is 4/3.
- The minimum focusing distance is 1.4m.
- Resolution center / edge 34/19 lines per mm.
- Aperture blades -12.
- Threaded optics - m39.
- The working segment is 45.2.
- Actual weight is 460 grams
Ergonomics and design:
A fairly compact lens, its length is just over 9 cm. Although its weight is a little overweight, almost half a kilogram.
The ergonomics of the lens were calculated for the first Zenith SLR cameras (3, 3M, Crystal), which were very compact. In the case of digital SLR technology (DSLR), the situation changes a little, using the lens is not so comfortable due to the large dimensions of the camera.
Aperture control is placed on the front of the lens, where the aperture ring and aperture presetting ring are located.
The diaphragm ring closes without steps, closes smoothly. The aperture preset function allows you to restrict the closing of the aperture to the desired value, which provides greater responsiveness. Its ring switches in steps with precise cutoffs of the aperture value.
The focusing ring of Jupiter-11 is wide and has grooves for more comfortable holding with your fingers; in winter, wearing gloves is quite comfortable. From infinity to closest focusing distance, you need to make an almost full 360 ° rotation, which takes an average of six finger interceptions. A bit too much for quick focusing, but with such a huge focusing ring travel, it is much easier to get into the DOF. The focusing process can be complicated by old dried grease that needs to be replaced. Or vice versa - excess lubricant creates excess viscosity.
The Jupiter-11 lens has 12 blackened rounded aperture blades. At any values of the aperture, the petals form a circle, the bokeh will always be with circles!
Enlightenment for all versions of Jupiter-11 is single-layer, in this case purple. A similar enlightenment was used on most Soviet and not only lenses (Helios-44, Helios-40, Jupiter-9, Tair-11, Mir-1). Color rendition pulls in yellow and purple tones - which is why the photographs are "warm".
Jupiter-11 with M39 mount for Zenith SLR cameras has a flange distance of 45.2. When mounted on a Pentax or even Zenit-19 SLR camera, the Jupiter-11 lens will not be able to focus at infinity. The whole problem is the difference in line segments between 45.2 and 45.5. In order to obtain a flange distance of 45.5, the Yu-11 lens must be twisted in two halves. With your left hand, grab the tail section (closer to the thread), and with your right hand, grip the front section and twist the front section counterclockwise. It should turn out like in the photo below.
In my case, there were four such rings, I removed two. If you remove all rings, the aperture ring will be gripped by the lens body. Attention: on the Nikon system, infinity can only be achieved with a file and small screwdrivers.
Optical and artistic qualities of the Jupiter-11 lens:
At an open aperture, the lens is sharp, that is, there is no desire to close the aperture. We wish the result can be obtained when the sun or a bright light source is not in the frame. A drop in resolution can be seen at the edges, but the result is quite acceptable.
As well as the mass of Soviet lenses, Jupiter-11 is negatively affected by side flares and obvious backlight, albeit to a lesser extent. It is accompanied by a drop in the resolution in the shadows and a drop in contrast.