Discontinued in 1971.

Lens can be identified from its predesor by observing where the "IR" mark is. If it is inside 4, it is the original 8 element design if it is outside the 4, it is the later 7 element design.

The later design was not modified other than SMC coatings up through the SMC Pentax 50mm f1.4.

The use of a rare earth element in the rear groups cause yellowing over time in the later versions. This yellowing can be bleached out by exposing the elements to UV in the form of sunlight orUV  lamp for weeks.

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The Oreston / Pentacon 50/1.8 is arguably the most successful Meyer offering. Being manufactured well into the late 80's, and was first manufactured for the Exakta RTL-1000 in an auto mount, and later in M42, M42 Electric, and later in Praktica B mount. This lens enjoy several charismatic properety, notably it can focus right down to 0.33 m , good enough for most close up; lesser known is the fact that the lens is almost a perfect symmetrical design and was a very faithful to the original Zeiss double Gauss Planar design ( with thich cemented center groups ) making it a very usable lens for reverse mount and bellow work. In fact it was remarked by many experienced in this lens that it seems to perform excellency in the macro / close up range.

A good quality lens, but it can give a puple/magenta tint to pictures taken with it,...Probably caused by internal reflections?

Its easy to focus and the aperture ring is easy to use.

close focus 1.5 - 15m

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It should be noted that the Auto M42 Pentacon 135/2.8 had a redesigned & recomputed optical formula which is developed from the original 135/2.8. Although both are of Triplet / Sonnar deriative of 5 elements in 3 groups design.

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This Lens had also been have with engraving read ' Soligor 135mm / 2.0 P " where the P probably refre to Pentax ....

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All technical data below is from the actual Vivitar Owner's Manual for this lens, dated October 1975:

Elements/Groups: 5/4

Angle of Acceptance: 12 degrees

Weight: 21 oz. (595gms)

Max Barrel Diameter: 2 11/16" (68mm)

Slip on Lens Cap Size: 68mm

Produced in Japan, this large 200mm telephoto lens is weighty and well-constructed, and fairly fast for a long lens. It has a pull-out lens shade built in, which is nice to have when you have a large front element like this. Besides the sturdy construction, the 8 aperture blades are slightly curved, making the aperture more circular, which results in pleasing bokeh areas. The A- M switch puts it in Auto aperture or Manual (stop- down) mode as usual. The lens is about 15cm long when fully extended (not counting the pull out hood), about 12cm at its shortest. It measures 22cm around (measuring around the rubber barrel grip). Minimum focusing distance is 6 feet (183cm).

The aperture is infinitely variable - the ring has no click- stops. The actual minimum focus distance is about 220cm, 250cm is the last number printed on the focus ring. This lens was also sold under the Pentacon brand. There are similar 200mm and 300mm Meyer lenses for Pentacon/Kiev medium format,

The lens has a pre-set diaphragm , so it will not need click-stops.

The camera mount is changeable, there exist, beside the M42 adapter, a Praktina and an Exakta adapter.

This Meyer Orestegor/Pentacon lens is very sharp.

The aperture is infinitely variable - the ring has no click- stops. The actual minimum focus distance is about 220cm, 250cm is the last number printed on the focus ring. This lens was also sold under the Pentacon brand. There are similar 200mm and 300mm Meyer lenses for Pentacon/Kiev medium format, BTW. No 200! for P'six.

The lens has a pre-set diaphragm , so it will not need click-stops.

The camera mount is changeable, there exist, beside the M42 adapter, a Praktina and an Exakta adapter.

This Meyer Orestegor/Pentacon lens is very sharp.  KR