Avon Imari BOLD/FANTASY (EDT), Kenlock Auto-S 135mm f/2.8 in M42 Mount (Cosina!)
Channel: Rattus Yu
Date: 27/10/2018

THIS IS A FOLLOW-UP VIDEO TO MY EARLIER LENS DEMO.
Here, I was testing the lens at the minimum focusing of 1.8 meters, then at f/2.8, f/4 and f/5.6 to show you a comparison of sharpness at those f-stops. This video also shows you the effect of backlight.

My earlier lens demo video:
https://youtu.be/tIX93w_VDt8

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Kenlock Auto-S 135mm f/2.8 (Cosina)

The vintage lens market produced alot of obscure names which were made by any of those famous Japanese lens makers like Tokina, Kino Precision, Cosina, Sun, etc.

This Kenlock Auto-S 135mm f/2.8 was pointed out by a commenter to be made by Cosina (who now makes those expensive Voightlander lenes). It appears to be made from early to mid 1970s  as the lens elements were treated with single coating. 

The Kenlock/Cosina 135mm f/2.8 is sharp at f/2.8 and obviously prone to flare, but still so much better than when shooting with my Nikkor-Q 135/2.8, single coated version also from early 70s.

Years Produced:
Around mid-1970s
Possibly by Cosina

Minimum Focusing Distance:
1.8 meters

Focus Throw:
180 degrees

Filter Thread Diameter:
55mm

Aperture Run:
f/2.8 - f/22
full-stop clicks
6 diaphragm blades

Optical Formula:
3 front elements, 1 rear element
all single coated with blue and magenta sheen

Other Features
No built-in retractable lens hood
It also appears under names like Weltblick, Seimar, Ringfoto and Super Weistar D
The M/A switch (M42) is at the back side of the lens

Made in Japan

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