Industar-58 3,5/75 Review
10
Industar-58 3,5/75 (Russian Индустар-58) is enlarger lens for medium format 6x6cm. Initially, Industar-58 3.5/75 was in a different barrel design and mounted on a medium format rangefinder camera "Iskra" and "Iskra-2", which were produced from 1960 through 1963 in the Krasnogorsk mechanical plant (KMZ). Later, it was redesigned on BelOMO (Belarus) for photographic enlargers and placed in a different barrel. The name remains the same Industar-58 3.5/75. Further, the lens was slightly redesigned and received the name Industar-58U 3.5/75, emphasizing that it refers to enlarger lenses.
Industar-58 3,5/75 Handling and Mechanics
The lens has impressive size and weight. Length is 120mm. The diameter of the front parts is 85mm. The diameter of the rear parts - 53mm. But much of it is a huge frame blend, thus obtained lens deep-set that eliminates the ingress of unwanted stray light into the lens.
Like all enlarger lenses, Industar-58 has no focusing mechanism. Therefore, to fully use it, you need a suitable helicoid. In front of the barrel is a ring aperture control. The diaphragm has 9 blades and is closed intermittently at 3,5-4-5,6-8-11-16-22. The mechanism of switching the aperture is made quite interesting. Inside the frame has a hole in which the set aperture value is displayed. The diaphragm closes discretely, and it is accompanied by switching pleasant soft click.
Mounting Industar-58 3.5/75 on a digital camera
Mount Industar-58 3.5/75 in the SLR was not easy. The constructive lens has a considerable size. This flange distance is not so long (62.76mm). Therefore, to take full advantage of the lens on the DSLR camera, need a helicoid, on the one hand, to provide a short flange distance, and on the other to it instead of the back of the lens. Fortunately, I have a helicoid from the mirror lens Cambron 500 f/8, which I use to mount the projection lens with a large diameter. Industar-58, in a perfect fit, while almost perfectly coincided infinity, was a small flight. To avoid axial misalignment and the lens does not play in the helicoid on the back of the I wrapped a small layer of electric tape, thus ensuring a smooth entry of the lens in the helicoid. And on the edge of the barrel, I also stuck to its helicoid with electric tape. 
The result was an easy-to-use lens with large dimensions. Industar-58 3,5/75 on Nikon D80. Focus it was convenient, and shooting is pleasant as if it was intended.
Examples are taken with the lens Industar-58 3.5/75
All examples are taken at wide-open on camera Nikon D3100. Export from RAW without any post-processing.
Industar-58 3.5/75 Sharpness
The lens is designed for medium format and has a resolution of center/edge of the 35/12 lines/mm, which means that it will be 35 mm almost all over the field in the small format. 
The lens shows no ringing sharpness at wide-open, but it is enough for most scenes. The lack of sharpness when I noticed a group of people shot in full view. But if you shoot portraits, sharpness is enough.
When you close the aperture to f/5,6, I have not noticed the sharpness increase; it has not changed. Perhaps it grew up on the medium format edges of the frame, but my crappy camera difference I not noticed.
Industar-58 3.5/75 Character and Bokeh
The lens has a nice Tessar character and bokeh. I liked its plasticity. Very beautifully blurs the background. 
A characteristic feature of this lens is the formation of bubbles bokeh, such as the form triplets. Industar-58 are not so noticeable but still greater than the other Tessar-type lenses. 
I liked this character.
Industar-58 3.5/75 Color and Contrast
The lens has a single coating. Due to the peculiarities of the Tessar optical design and its constructive, Industar-58 has good contrast and color reproduction. 
Colors are luscious but at the same time natural.
Lens copes with strong side illumination. And moderately keeps backlight. Of course, if you resort to framing a strong light source, there will be, but it is well behaved in the bright sun in most cases. 
Summary
Industar-58 3.5/75 good Tessar-type lens. It has good optical characteristics and constructive. I liked it very much, and I decided to leave it in his collection, of the main drawbacks of mounting on the camera. 
ibiyoli
Wed, 2022-01-05 23:18
ahabozniz
Wed, 2022-01-05 23:45
asoyehtaofz
Thu, 2022-01-06 02:10
ialfuqipahl
Thu, 2022-01-06 09:06
uqirarie
Thu, 2022-01-13 19:13
eceweoobicumi
Thu, 2022-01-13 20:18
ohigajisjodo
Thu, 2022-01-13 20:36
azacoqo
Fri, 2022-01-14 00:48
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