Auto mamiya / sekor 1 review: 2 f = 50mm

According provided by Auto mamiya / sekor 1: 2 f = 50mm lens. Many thanks to the reader of Radozhiva - Vladimir Pivovarov.

Mamiya-Sekor 50 mm F / 2 Auto

Mamiya-Sekor 50 mm F / 2 Auto

Auto mamiya / sekor 1: 2 f = 50mm - old manual fifty kopeck piece for cameras with M42 mounting thread. The lens was originally produced for the Mamiya / Sekor DTL series cameras (models 500, 1000, 2000). There are several modifications of this lens, which differ in the color of the body, the M <-> A switch and the spelling of the lens name (mamiya / sekor or MAMIYA-SEKOR). This review presents a version of the lens with chrome inserts.

Auto mamiya / sekor 1: 2 f = 50mm is perfectly assembled, as it should be with an old metal lens. The focus ring is metal, ribbed and rotates on 270 degreesmaking focusing simple and enjoyable. During focusing, the frame rim moves forward, but does not rotate. Focusing is carried out by moving the entire lens block.

The lens has the usual fifty dollars aperture, and, unfortunately, most likely, a simple chemical enlightenment of optics, which makes it very weak when working in backlight. In the backlight, the lens simply chokes on the amount of glare, ghosting, rainbows and flare.

Main technical specifications Auto mamiya / sekor 1: 2 f = 50mm

The name of the instance from the review (as it is written on the lens itself) Auto mamiya / sekor 1: 2 f = 50mm No.123689
Basic properties
  • M42x1 / 45.5 - common 'M42' seating thread.
  • CAR - semi-automatic aperture control using a diaphragm ring and a diaphragm pusher of cameras that have it.
  • M <-> A - aperture control mode switch.
  • manual focus only.
  • simple (single layer) enlightenment of optics. Exact data on type of enlightenment not found.
  • The lens is suitable for full-format cameras.
  • full metal case with metal controls.
Front Filter Diameter 52 mm
Focal length 50 mm, EGF for cameras with an APS-C type sensor is approximately 75 mm
Zoom ratio 1 x
Designed by for film cameras with a frame size of 36 mm X 24 mm
Number of aperture blades 6 rounded petals. At an F / 2.8 value, an intermediate value between F / 2 and F / 2.8, and an intermediate value between F / 2.8 F / 4, the petals form a hole with small notches. At values ​​from F / 4 (inclusive) to F / 16, the petals form an irregularly shaped hexagon.
Tags focusing distance in meters and feet. The depth of field scale for F / 2, 2.8, 4, 5.6, 8, 11, 16. An infrared shift indicator point. A scale with aperture values ​​for F / 2, 2.8, 4, 5.6, 8, 11, 16. You can set one intermediate value between pairs of numbers (but there is no intermediate value between F / 11 and F / 16).
Diaphragm F / 2.0 to F / 16.0, adjustable with aperture ring. There is a switch M <-> A on the lens, which is responsible for the method of aperture control: 'M' - fully manual control, 'A' - semi-automatic, allows sighting at a fully open aperture and close it to the set value only at the moment of shooting. The 'A' mode only works on those cameras that have a corresponding aperture control mechanism (skip).
MDF (minimum focusing distance) the extreme mark on the scale is 0.5 m, but the focusing ring rotates a little more towards the MDF, and most likely the MDF is approximately 45 cm.
The weight 210 g (approximately)
Optical design exact optical design and pattern not found, but most likely this is some of the planars for 6 elements in 4 groups.
Lens hood screwed into the front filter, marking of the original hood not found.
Manufacturer country Japan (LENS MADE IN JAPAN)
Period Since about 1968, the timing of the discontinuation of production is unknown. Later, the lens was replaced with a similar model without the M <-> A switch.

How to use with modern cameras?

Lenses with mounting thread M42 (M42 X 1 / 45.5), such as the lens from this review, are very easy to use on almost any modern digital camera (both SLR and mirrorless), for this it is enough to choose the right adapter (adapter). You do not need to carry out any additional steps to modify the lens.

The cheapest adapters can be found There are adapters (adapters) with a chip that provide more convenience during shooting, usually chips are used to confirm focus and / or metering exposure, and form the correct EXIF. The chip does not affect the image quality in any way.

For some SLR cameras (for example, Nikon F) it is necessary to use adapters with a corrective lens, which allows correct focusing at all focusing distances. For any mirrorless camera, such a lens is not needed, and the adapter is a simple decorated hollow metal tube with an appropriate mount.

For SLR cameras

  1. Canon: For cameras Canon EOS with bayonet mount EF / EF-S need an M42-Canon EOS adapter, such an adapter with a chip can be found herewithout chip here.
  2. NIKON: For cameras Nikon DX / FXas well as for cameras Fujifilm и Kodak with a Nikon F mount, you need an M42-Nikon F adapter, you can buy such an adapter without a lens and a chip here, with a lens without a chip herewith chip without lens here, with lens and chip here. Why a lens? Why chip?
  3. PENTAX: For cameras Pentax with mount K you need an adapter M42-Pentax K, you can buy such an adapter here.
  4. SONY/MINOLTA: For cameras with a Sony / Minolta A mount, you need the M42-Sony A adapter, you can find such an adapter without a chip at this linkwith a chip at this link.
  5. OLYMPUS / PANASONIC / LEICA: For cameras with a 4/3 bayonet mount (not to be confused with Micro 4/3!) You need an M42-4 / 3 adapter, you can buy such an adapter here.

For mirrorless cameras

  1. SONY: For cameras with an 'E' series mount SonyNEX и Sony Alpha you need an adapter M42-Sony E (aka M42-Sony Nex), you can find it at this link. An autofocus adapter is also available for these cameras. Techart PRO Leica M - Sony E Autofocus Adapterwhich can be found at this link.
  2. OLYMPUS / PANASONIC / KODAK /  XIAOMI: For cameras with a Micro 4/3 bayonet mount (Micro 4: 3), you need the M42-Micro 4/3 adapter, you can find it at this link.
  3. CANON M: For cameras with a bayonet mount Canon EF-M need adapter M42-Canon M, it can be found at this link.
  4. CANON R and RF-S: For cameras with a bayonet mount Canon r need adapter M42-Canon R, it can be found at this link.
  5. Nikon 1: For cameras Nikon 1 Series need adapter M42-Nikon 1, you can find it at this link.
  6. Nikon Z: For series cameras Nikon Z need adapter M42-Nikon Z, it can be found at this link.
  7. FUJIFILM X: For cameras with mount X need an M42-Fuji X adapter, you can find it at this link.
  8. FUJIFILM GFX: For medium format cameras G-mount need M42-Fuji GFX adapter, you can find it at this link.
  9. SAMSUNG: For cameras with NX mount need adapter M42-Samsung NX, you can find it at this link. For the camera Nx mini adapters do not exist yet.
  10. PENTAX: For cameras with Q mount need an adapter M42-Pentax Q, you can find it at this link.
  11. SIGMA / PANASONIC / LEICA: For cameras with L mount, you need the M42-Leica L adapter, you can find it at this link.
  12. LEICA: For cameras with a Leica M mount need adapter M42-L / M, you can find it at this link.

If you have any questions on compatibility and adapters - ask in the comments (comments do not require any registration at all).

Image quality

The lens is not very sharp at f / 2.0, when the aperture is closed, the sharpness returns to normal. Sharpness at f / 2.0 is enough for what is now called 'creative expression' :). The lens has good contrast, which suffers a little from spherical aberrations and drops a lot when working in backlight and side light, where the lens shows itself very poorly. I would also like to note the unpretentious bokeh and, in general, a pleasant pattern.

I would not say that Auto mamiya / sekor 1: 2 f = 50mm boasts something special. Test photos below.

You can download RAW source files at this link (38 files in the '.ARW' format, 800 MB). All photos are on-camera JPEG from the Sony a7 camera, there are more photos in the archive when shooting at infinity. On a full-length mirrorless camera Sony a7 I used a lens with an adapter without any problems M42-NEX.

Comments on this post do not require registration. Anyone can leave a comment. Lenses and promotions on them look at


Auto mamiya / sekor 1: 2 f = 50mm is a simple and pleasant lens that does not stand out in any way among thousands of other fifty dollars of the past. The lens does not tolerate backlight very well; it is better to use it with a hood. Creates a pleasing image overall. Due to its low cost, it can serve as a classic creative fifty dollars.

Material prepared Arkady Shapoval... Look for me on Youtube | Facebook | Instagram | Twitter | Telegram.

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Comments: 16, on the topic: Review Auto mamiya / secor 1: 2 f = 50mm

  • Artyom

    Yesterday I sold this (only the version is completely black) for 1500 rubles to a lover of Mamia. Nothing special, except for a nice size and comfort, I did not find in it.
    Thanks for the review;)

    • Serge36ru

      And Fujinon, by type as in the photo was not used by chance? I want to buy something like that, the current with a hole of 1,9, but I did not find any reviews ..

      • Artyom

        Used Fujinon EBC 50 / 1.4. And all the fujis are gorgeous! The EBU backlight is especially excellent. 50 / 1.4 I sell on urgency, unfortunately ...

        • Arkady Shapoval

          EBC is a great thing.

        • Serge36ru

          Thanks for the info!)

      • Arkady Shapoval

        On Radozhiv there will be an overview of this Fujinon.

        • Artyom

          ABOUT! I will really wait!

    • anonym

      I Olympus 50 1.8 the same for 1500r offer.

      Will he be worse than this Mamia?

      • Artyom

        No worse

  • Dmitriy

    But what a beautiful lens)))

  • Olegjan

    I liked the lens. Another interesting photo is the same.

  • Yuriy75

    An excellent concise review, even from the glare and highlights, the author managed to get something special! And the photo, where the grass hugs the pipe that goes into the distance, aroused admiration!

  • Vyacheslav

    Hello Arkady!
    Many thanks to you for the photo "enlightenment"!

    Tell me please:
    I really like the lenses of this brand. I want to take it.
    But I notice that on mamiya glasses for 35 mm, almost always enlightenment is dark yellow-brown.
    Is this a sign of thorium / radioactivity?
    Or is there another explanation?
    I do not want to be exposed to unjustified risk once again.

    • Passed by .......

      Slavon covered himself on the cob of thorium dioxide ...

    • Eugene

      natural background. glass poses no danger

  • Eugene

    mdf it is not 45 but rather something like 48cm. and the optical design is not 6 in 4 but 6 in 5

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