The Pentacon Auto 135mm f/2.8 MC is a telephoto lens manufactured by VEB Pentacon in the GDR. Meyer-Optik Orestor 2.8/135 in the past.
Lens for SLR cameras with M42 screw connection. This lens is installed on modern SLR and mirrorless cameras through the appropriate adapter. Read the article about adapters.
Review lens provided by Sergey Pomidorov, thanks to him for that!
In good condition, with factory set (wardrobe trunk, hood, without instructions). VEB production Pentacon, 1981 (most likely Meyer-Optik), white and green paint used in markings.
Pentacon Auto 2.8/135 - tentatively produced in 1982. The case is made of metal, has a built-in hood. The hood is emblazoned with the inscription German Democratic Republic Pentacon Auto 2.8 / 135 and the serial number 8280877. The hood runs along the outer diameter lens, has matting inside. In the stowed position, the hood folds down and does not hide the controls. One of the many German lenses of the Soviet bloc, which left a pleasant impression on itself.
They can be found with and without multi-coating, with and without electrical contacts, with various options for attaching to cameras (m42, Praktica B). The body of the Pentacon Auto 2.8 / 135 has the shape of an elongated tube, painted, metal. Multi-coated lenses have a brown or purple tint, depending on the angle from which you look at the glass. The lens itself is small in size. At the end of the housing closest to the camera lens there is a switch for the automatic iris operation, after which there is a control of the iris with a lock and a focusing ring.
The focusing and diaphragm rings are metal and have milled lugs for better grip. The rotation of the rings is soft and smooth. The diaphragm ring has a detent that emits a slight click when shifting. The inscriptions on the frame are engraved and filled with paint. The body is assembled flawlessly - no backlashes, no gaps.
Focus ring lens ribbed, rotates smoothly and almost 360 degrees for precise focusing. If the lens has not been serviced for a long time, the factory grease thickens and the rings become tanned in the cold. The front lens does not rotate when focusing.
Due to the shallow depth of field, focusing on cameras with a small viewfinder size can have focus errors. Better to use LiveView or adapter rings with focus confirmation chip. The front edge of the lens barrel extends at the maximum focusing distance - about 1,3 cm. The minimum focusing distance lens - 1,5 meters, marking starts at 1,7. In fact, there is an overrun of the ring towards the minimum distance. Infinity with my adapters did not work out - the scale of the focusing distance is so precisely adjusted. Just a little bit was missing. See examples below. The pipe is located a little further than the tower, while it did not reach the pipe, but hit the tower. Shooting with a tripod.
The Pentacon Auto 2.8 / 135 MC has a 6-blade iris diaphragm that can be used to hips not even circles are drawn from light sources at any f / value, but hexagons.
Pentacon Auto 2.8 / 135's relative aperture is adjustable from 1: 2,8 at open aperture to 1:22 at fully closed aperture. The aperture presetting mechanism is not suitable for use on modern cameras. Modern digital cameras estimate the exposure level in the frame at an open aperture lens (in fact, old films too). The final calculation of the exposure should take place at the moment of closing the electronically controlled diaphragm, just before opening shutter... For correct use lens on modern cameras, you need to use the exposure lock function, or adjust the exposure later, in post-processing.
In modern digital cameras, the aperture is preset by software, the diaphragm is closed electronically immediately before opening shutter... The Pentacon Auto 2.8 / 135 is designed for use with a mechanical diaphragm push mechanism. Fortunately, there is a switch on the frame for the "Manual" mode for applications outside the nodes of suitable cameras. By activating this mode with a switch, the diaphragm mechanism is locked. In automatic mode diaphragm open by default, and a mechanical drive pin protrudes on the back. Depth of field is small, and does not increase much with aperture, however, sharpness from f / 3,5 only increases all the way up to f / 8.
The lens has good sharpness and color rendering. At an open aperture, there are slight color aberrations in contrasting transitions. In LiveView mode, they are purple, and in frames they are yellow or purple tinged. Not always and not in all frames. Mostly in the presence of strong light.
Aberrations are stifled without problems in the simplest photo editors. The lens has multi-layer coating, but the picture quality drops in backlight or side light. Not always so strong that it is impossible to pull the file out of RAW. The work is clearly presented below lens in backlight and side light
Flare is enhanced by the presence of unpainted lens ends lens (well, or, the effect of time is as follows) and the re-reflection of light from these raw ends:
At the same time, the lens copes well with flare. For example, the glare looked like a glare in my eyes, but through the camera lens it completely lost its appearance.
On a camera with an APS-C matrix (kf = 1.6), the camera will have a field of view equal to the equivalent of 216mm focal length, and the aperture will correspond to the value f / 4,5... Why is that? Because, firstly, because of the narrow viewing angle, you will have to move further. Secondly, the camera's sensor receives 1,6 times less light than a full-frame 35mm sensor. Thirdly, although this does not apply to the previous two statements, the lens on the crop has a drop in sharpness due to the denser arrangement of pixels on the matrix and their concentration in the center of the lens.
On a full frame, the lens works as intended - it has a more flexible picture and characteristics corresponding to the declared ones.
The easiest way to shoot is in the mode Aperture Priority (Av)when the camera adjusts the required shutter speed based on the current aperture value and the light in the frame. To work on digital cameras, you need an adapter from the M42x1 threaded connection to your camera. Pentacon Auto 2.8 / 135 it is easiest to put on Canon EOS with EF (-s) mount, due to the insignificant difference in focal lengths. Adapters without focus confirmation chips on Canon are cheap.
To work on digital cameras, you will need an adapter from the M42x1. The easiest way is to put this lens on cropped Canon EOS with EF-s mount, especially considering that adapters without chips on Canon cost mere pennies.
By ordering things from the links below, you help the project cover the costs of site maintenance and development. List of adapters, systems and mounts (direct links for ordering)
When ordering, it should be borne in mind that cheap adapters of poor quality with a lens on bayonetf Nikon F spoil the picture significantly. Adapters without a lens reduce the maximum focusing range (due to the difference in focal lengths). Adapters with chips come across poor quality, exposure metering and focus confirmation on some Canon EOS models may suffer from this.
The Pentacon Auto 2.8 / 135 lens loses contrast when shooting in backlight and side illumination. The lens is very sharp from open apertures, but draws hex flares in hips due to 6 petals. average price lens on the secondary market - 4000 rubles. Personal impression is pleasant, if there is an opportunity to use - use it.
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