Tokina-produced Vivitar (Ponder & Best) similar to Soligor T4 135mm lens of the same era.
This lens was designed prior to the later TX mount lenses, which reportedly included a redesign of the optics. Optical design: 4 elements in 3 groups. Built-in hood.
February/March 1969 issue of Camera 35 magazine: "Besides being just a few dollars less expensive and one half a stop slower than the 135mm f/2.8 T-4 lens, this 135mm f/3.5 is a little bit sharper. Just a bit. In fact, I think that with average picture taking situations, you probably would not be able to tell the difference between the results As test results indicate, performance picks up at f/11--f/16. This is not to say it doesn't perform well at other openings. Being somewhat lighter than the faster version, it may be a bit easier to tote around in your gadget bag. An excellent buy." ($84.50 list price in 1969)
https://www.flickr.com/photos/nesster/5262734069/sizes/o/in/photostream/
Automatic aperture (M42 pin with T4 mount)
Focal length 135mm
Max. aperture f3.5
Min. aperture f22
Blades 6
Min Focus 1.8 m / 6 ft
Filter Ø (mm.) 49
Weight (gr/oz) 340 / 12
Length 8.9 cm / 3 1/2 inches
First year of production: 1969
Front ring nomenclature: AUTO Vivitar TELEPHOTO 135mm 1:3.5 No.(serial number, beginning 37...)
Reported Resolution (lpmm)
Aperture Center Edges
f/3.5 40 34
f/4 40 34
f/5 48 34
f/8 56 40
f/11 56 48
f/16 56 48
f/22 40 34
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