Zonar Krasnogorsk was most likely made from components sent from Germany, including optics (at the level of guesswork). It's no secret to anyone, German experts helped (voluntarily-forcibly) collect the first samples of photographic equipment and optics. After changing the name (if you want to rebrand), and the name was changed when the German parts and lenses were over, the optical scheme was counted for our grade of optical glass. Perhaps at this stage, the Jupiter-9 lens began to concede Carl Zeiss Sonnar 2/85 in technical specifications.
Focal length 85 mm.
The type of aperture is iris.
The number of aperture blades is 15.
Maximum aperture 16.
The minimum focusing distance is 0.8 meters.
The number of lenses / groups is 7/3.
The angle of view is 28 °.
Resolution center edge 30/18 mm.
The subject's enlightenment is single-layered.
Threaded mount to the m42 camera.
Thread for m49 filters.
Ergonomics and design:
Jupiter-9 has a simple and at the same time extremely reliable design. It consists of two main parts - a helicoid and an optical unit with a diaphragm. In this case, it is possible to compose blocks (helicoid or lens block) from other versions of Jupiters-9 (Yu-9 automatic exception).
As for the convenience of using the lens, it can be noted that the Yu-9 does not have a diaphragm jump pusher. On the one hand, it is superfluous on digital cameras, as there will be no connection with the pusher. And on the other hand, at the Zenith, we are losing speed. Given that most owners use the Jupiter-9 lens on DSLR cameras, the absence of a jump is a definite plus. The gain in reliability should not be missed.
There is no jumping because the lens has fifteen blackened aperture blades that form an even circle. Closing or opening the diaphragm is smooth, without jumps and steps.
As for focusing, it is smooth, with a nice tight viscosity. Although the last parameter depends on the condition and quantity of the lubricant. From Minimum Focusing Distance (MDF) to infinity (∞), you need to make a revolution of approximately 225 °, which takes 5 finger intercepts. We have the opportunity to focus as accurately as possible on the subject, on the other hand, we again lose efficiency.
Art features and photo examples:
The Jupiter-9 85 mm f / 2 lens is very good as a portrait portrait. It produces a rather sharp, but plastic and voluminous picture. Due to its low resolution and low contrast, it transmits semitones well and hides skin defects. Convenient smooth focusing. Sonnar's optical design allows for a smooth transition from sharply imaged to unsharp areas. Draws an airy picture, with a light monocle effect, subtle software.
Jupiter-9 is a classic portrait lens with a characteristic pattern for its era. Sharpness, contrast, blurring the background - everything in it is at that level to get good photo portraits! Easy to use and well assembled!