LOMO OKS11-35-1 F = 35 1: 2. Review from the reader Radozhiva

Overview LOMO OKS11-35-1 F = 35 1: 2 specifically for Radozhiva prepared Rodion Eshmakov.

LOMO OKS11-35-1 F = 35 1: 2. Review from the reader Radozhiva.

LOMO OKS11-35-1 F = 35 1: 2. Review from the reader Radozhiva.

Issued in the 1980s by the Leningrad Optical and Mechanical Association OKS11-35-1 - The film-making lens is a normal fast lens for 35 mm movie cameras with a mirror shutter (Kinor-35, Konvas).

Specifications :

Optical design: 6 lenses in 5 groups, an “inverted” biometar with a split back component, view of circuit 1, 2, 3;
Focal length - 35.72 mm;
Relative hole (geometric) - 1: 2;
Frame format - 35 mm film, 16x22 mm (Kf = 1.5);
The back section is 34.97 mm;
Light transmission coefficient - not less than 0.8;
Resolution - 55 lines / mm (center), 25 lines / mm (edge);
Dimensions - 45 mm (the largest diameter of the frame), 88 mm (length);
Mass - 115

Features of the design and adaptation of the lens

OKS11-35-1, which fell into my hands, is a lens unit with a diaphragm mechanism, devoid of a focuser and a specific mount (usually for cine lenses, this is the OST19 bayonet). This cine lens is a rare representative of the short throw (<75 mm) cine optics, which can be mounted on modern CZK while maintaining focus at infinity. At least, the flange is enough for the lens to work with Canon's digital lock with Kf = 1.6. Owners of full-frame digital cameras will not be able to fully use the lens even in crop mode - the mirror will interfere.

oks-11-35-1-f2-lens-review-5
The adaptation procedure is extremely simple thanks to our friends from the Middle Kingdom, who established the production of relatively inexpensive and fairly decent macrogelicoids: I planted the lens lens block in a 12-19 mm helicoid. In this case, a range of focus distances from ~ 40 cm to “infinity” is achieved.

Adapted OKS11-35-1 in comparison with Canon EF-S 24 / 2.8 STM. The quality mark is visible on the movie lens.

Adapted OKS11-35-1 in comparison with Canon EF-S 24 / 2.8 STM. The quality mark is visible on the movie lens.

The lens designers did not stint on the excellent blackened ten-petal diaphragm, which always gives a round hole and ten-beam stars from point sources of light.

Aperture OKS11-35-1

Aperture OKS11-35-1

The lenses of the lens carry a beautiful green multilayer enlightenment, infrequent for 1986, in which, judging by the number, the lens is released. All the best for the movie.

Multilayer coating OKS11-35-1 shimmers with green, pink, and blue.

Multilayer coating OKS11-35-1 shimmers with green, pink, and blue.

Despite the multilayer enlightenment, the lens slightly warms the color.

Slight yellowness, visible when looking through the lens on a white background

Slight yellowness, visible when looking through the lens on a white background

Unlike photo optics, the red scale on the lens indicates T-stops of the diaphragm, and not the usual F-stops. In other words, the values ​​of the real (taking into account light transmission), and not the geometric aperture, are shown. Therefore, in this article we will use the notation through T-stops.

The first value on the aperture ring - T / 2.3 - corresponds not at all to an open aperture, but to a slightly closed one: this can be seen not only when considering the operation of the diaphragm mechanism in this area, but also (indirectly) from technical information. So, if F / 2 corresponded to T / 2.3, then the light transmission coefficient was below 0.8, which cannot be (according to TU). Open aperture F / 2 corresponds to ~ T / 2.2.

OKS11-35-1 combines high aperture and a short focal length with very small (compared to any other 35/2 for SLR cameras) dimensions, which makes it a great option for a regular lens for crop DSLRs. Smaller, perhaps, is the dark and longer T-43 40/4. But will optical quality allow him to be a favorite staff member?

Optical properties

Like the Vega-3 50 / 2.8 related optical lens, the OKS11-35-1 forms a very sharp image in the center of the frame on the open aperture with a strong and rapid drop in resolution to the edges.

Change focal sharpness from F / 2 to T / 5.6 when focusing to infinity

OKS11-35-1 T2.3

OKS11-35-1 T2.3

OKS11-35-1 T5.6

OKS11-35-1 T5.6

In the F / 2-T2.8 range, spherical aberrations are clearly manifested (in the bokeh there is a bright edging of the circles of blur in the center of the frame), up to T / 5.6, the edges are strongly influenced by field aberrations (coma, astigmatism).

Change sharpness with aperture from F / 2 to T / 2.8 when focusing at close range

OKS11-35-1 T2

OKS11-35-1 F2

OKS11-35-1 T2.8

OKS11-35-1 T2.8

Completely incorrigible diaphragms are transverse chromatic aberrationthat appear at the edges of the frame (orange and blue borders). What to do - apparently, the lens does not use any special types of glass and, moreover, special optical elements.

Change the picture with aperture from F / 2 to T / 2.8 and T / 4

OKS11-35-1 T2

OKS11-35-1 F2

OKS11-35-1 T2.8

OKS11-35-1 T2.8

OKS11-35-1 T4

OKS11-35-1 T4

It is not difficult to notice severe vignetting (> 50% at F / 2) even on a camera with Kf = 1.6. This lens, of course, will not cover a full frame. Moreover, OKS11-35-1 has a noticeable field curvature (an arc similar to aplanat lenses: behind aperture and the working period must be paid. Sometimes not only money.

A set of aberrations and other disadvantages of the optical scheme gives the OKS11-35-1 a specific bokeh. Aperture does not spoil it with sharp shapes: 10 aperture blades always ensure smooth edges of circles of blur. Perhaps, only Primoplan 11 / 35 and ISCO Westron 1 / 58 possess perhaps similar to ОКС1.9-35-2.8 bokeh. The Vega-3 lens (normal biometar) has a “reverse form” bokeh with respect to OKS11-35-1 (“inverted” biometar).

The effect of aperture (F / 2, T / 2.8, T / 4) on the side OKS11-35-1

OKS11-35-1 T2

OKS11-35-1 F2

OKS11-35-1 T2.8

OKS11-35-1 T2.8

OKS11-35-1 T4

OKS11-35-1 T4

OKS11-35-1 has a good overall image contrast due to multi-layer enlightenment and copes well with backlight. This lens does not even catch glare: in the harshest sun, occasionally not the most aesthetic green bunnies appear. Most likely this is also due to the lens design that does not contain a large front lens (like Mir-1 and other 35 / 2.x class optics). It is also difficult to make complaints about the color rendition of OKS11-35-1.

Will the OKS11-35-1 35/2 on crop cameras be better than, for example, the Soviet Mir-24 35/2 MS of the same release years? Rather, yes: better light resistance and compactness give a tangible advantage with similar optical quality (I would trust this lens a little more than YongNuo 35/2). Will the OKS11-35-1 35/2 be better than modern aperture thirty-five? Unless in size.

More photo examples (Canon 600Dshooting in RAW and developing in Canon DPP) are shown below.

Conclusions

OKS11-35-1 is a unique Soviet cinema lens with unique characteristics, which has an amazing design (movie magic? :)) and even more amazing compatibility with modern crop-CZK cameras. However, he is still a Soviet product of his time and super-high quality images you should not expect from him: a lover of sharp pictures and high aperture is more likely to pay attention to Samyang 35 / 1.4, and a fan of dizzying bokeh - to Meyer Primoplan 58 / 1.9. But some of the advantages of the OKS11-35-1 - the unusual compactness on the central defense complex and the Soviet indestructibility - have not yet been defeated.

Thank you for your attention, Eshmakov Rodion.

You will find more reviews from readers of Radozhiva here.

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Comments: 28, on the topic: LOMO OKS11-35-1 F = 35 1: 2. Review from the reader Radozhiva

  • Michael

    Thanks for the review. But I liked this lens, very evenly, soft neuroviglazny bokeh. Sorry, a drop in sharpness around the edges

    • anonym

      What are you? Bokeh vyrvishlaz still and what !!

  • Sergei

    I wonder how much this device costs now?
    Or what price Rodion considers normal and fair for him.
    The cost of the Chinese helicoid and adapter rings can be found on Ali.

  • Ilyas

    Surprisingly, a cool lens!

  • anonym

    Rodion, Yong 35 / 2.0 covers the full frame and autofocus and without alterations, only, probably, it will turn out to be more expensive

    • anonym

      Yong can be used as an ashtray, but in any case not as an objective.

      • anonym

        This is a Soviet consumer goods, where the blackened diaphragm is already the peak of perfection, can be used for other purposes

        • anonym

          If you use words, you write correctly.

  • zengarden

    Rodion, thanks for the review! An interesting lens. Landscape photos are very good.
    I liked the photo with grass, where the "bubbles" from the glare of drops :)
    And can you read more about the Chinese macrogeloid? link to it, for example.

    • Rodion

      The Chinese are doing these: link

  • Pokemon

    “The lens designers did not skimp on the excellent blackened ten-blade aperture, which gives an always round aperture and ten-ray stars from point light sources.”
    Ehhh yoklmn that would be like this more often ...
    And then they ask for a multi-valued amount for the lens, but in the diaphragm there are less than 9 petals.
    Interesting, difficult bokeh and nice picture.
    Thanks for the review.
    PS> Rodion, where was the sakura filmed in Moskkva?

    • Rodion

      Sakura near the first humanitarian building of Moscow State University. It blooms early - at the end of April - when the rest of the trees are not yet blooming.

      • Pokemon

        Thank you!
        This year I managed to see and take a picture of her in the pharmacy garden at Moscow State University.

  • anonym

    Greetings!
    Liked all the photos. Wow!

  • anonym

    Here, flowers, looked beautiful! And he went on ... And these shots, but on film, you can't take your eyes off. I would also like to arrange it in a frame, that's it!

  • anonym

    The quality of photographs is 3 bali. Nemaє yaskravosti. The contrast is so, in the middle.
    Radianske chorninnya inner surfaces about, assets and enlightenment surfaces of linz - they played through modern Japanese chi nimetskim.

  • anonym

    this lens has the most common blurry picture, low contrast, low micro-contrast and dirty color.
    “Magic” it must be understood as a dirty “shroud” associated with the lousy optical properties of OKS11-35-1.
    for example, here is a photo of sakura and all kinds of colors without editing on lenses with normal color and contrast:
    https://a.radikal.ru/a41/1905/3f/6dee126a6694.jpg
    https://c.radikal.ru/c29/1905/7f/db0aa88afba1.jpg
    https://d.radikal.ru/d14/1905/c9/d9b33bde6770.jpg

  • Alexey

    Thanks for the review!

  • anonym

    Great review, good lens, thanks

  • an

    I didn’t remember a little Helios-33 in the picture. Did not compare? G-33 are more likely to come across.

    • Rodion

      Helios-33 is proportionally scaled down to G-44. A completely different lens, of a much worse optical quality and, moreover, cannot be installed on the DSC with infinity preservation (therefore, I did not compare). Really come across often and inexpensively (the reasons for this have already been indicated))).

      • an

        I shot a lot on the G-33 and the quality of the picture was very happy, of the helios with a focus of 35-50, perhaps the most successful. It is from an artistic point of view. Moreover, it works reasonably well at full frame (Sony A7), but on Crop 1,5 it’s generally super. On the central lock, of course, it is almost useless, only to shoot macro.
        G-44 has a completely different picture by the way. But it looks like this ACS.

  • Onotole

    I wonder how it happened that the scattering circle on T4 is even larger than on T2.8? Is the focus distance changed between frames?

    • Rodion

      I tried to make the size of the circles the same for these frames, twisting the helicoid. With T4 missed a little.

  • Slavik

    excellent lens. and it’s very similar to the primoplan, you correctly noticed

  • Alexander Hedgehog

    An excellent 35, this is one of my favorite creative lenses for shooting video! It’s soft on the open, but at 2.8 it’s what you need, while the plastic and unobtrusive distant blurring of the image.
    I had a version of ost18, with a hood which I saved and adapted to g44m4. Then I did not even try on the subject of installation on DSLRs, for some reason I was sure that several mm would not be enough, and after all, the speedbooster can be used. Damn, now at least redo it together with half a line ...

  • Ran

    what adapter did you use to connect the Lens block to helicoid?
    helicoid thread is M42, lens block thread is M36? how to connect?

    • Rodion

      glue :)

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