Industar-100U 4/110 (I-100U) Review
I-100U 4/110 (Russian И-100У) is enlarger lens for large format. Designed to frame format 6x9 cm. Produced at the Lytkarino Optical Glass Factory (LZOS). Like all Industars has an optical design 4 elements in 3 groups (Tessar).
I-100U 4/110 Constructive
The lens has a good barrel design in the style of the large format photographic lenses. The diameter of the barrel is 42 mm.
The lens length is 4 cm. In the middle of the frame is a ring aperture control. It switches discrete and tight, it would be possible to make softer because when it switching, focus is strays.
The diaphragm closes by full steps: 4-5,6-8-11-26-22. It has 10 blades. Blackening them missing. The blades are visible even at wide open aperture, I think without blades the lens will have a slightly higher aperture ratio, a little bit. Like all enlarger lenses Industar-100U has no focusing mechanism. And in order to fully use it for taking pictures need helicoid, good news, flange distance allows it. For leisurely studio shooting can also be used bellows.
There are two rear mounting thread. One M42 and one M35. Apparently so designers have solved the problem of compatibility with a variety of photographic enlargers. The lenses have a single-layer purple coating.
Industar-100U 4/110 mounting on the camera
The lens has a long flange distance, it is inherent in all large format lenses. To install it on a Nikon camera i used homemade helicoid and the large extension ring.
View on Nikon D3100
In this constructive I have focused on a distance of about 20 meters. I tried to get it to infinity, screwing instead of one large ring, small and medium, but, ironically, in this position I'm a little bit not reached infinity. The focus Industar-100U to infinity does not make much sense, since the lens has a slight sharpness, this will be discussed below. Construction in size to me something reminded Jupiter-11 4/135, it also has a small diameter and similar length.
Industar-100U Sample Photos
All examples are taken by the camera Nikon D3100, at wide open. Exports from RAW without any post-processing.
Industar-100U 4/110 Sharpness
As mentioned above, the lens has a low sharpness. The technical data indicated that the lens resolution at 5-x reproduction ratio is equal to 70 lines in the center. Maybe the way it is, but on normal distances sharpen is weak.
But there is some special charm. Portraits are not bad.
Industar-100U 4/110 Character and Bokeh
The lens has a nice vivid character.
Boke and I liked it. I do not expect such a nice bokeh of the enlarger lens.
Bokeh I liked it more than the Vega- 5U 4/105 with its biometar-like optical design.
Industar-100U 4/110 Contrast and Color Render
Unfortunately, when I shoot the pictures for this review it was cloudy, so fully check the lens not able.
But what I noticed, it's afraid of a strong side and the backlight. This is typical of almost all Soviet lenses. Apparently Soviet glass is not as good as the German and Japanese.
The lens passes quite normal pleasant colors.
Red and orange colors are very bright, despite the cloudy weather.
Industar-100U 4/110 is good lens, despite low resolution is a nice character. It can be used for artistic photography, for macro-sketches and portraits.