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LENS PORN: Petri 55mm f/1.8 CC Auto in Petri Bayonet Mount (TOKINA) with Swirly Bokeh!

Petri 55mm f/1.8 CC Auto in Petri Bayonet Mount (TOKINA)
Petri 55mm f/1.8 CC Auto in Petri Bayonet Mount (TOKINA)

Petri was a budget brand that sold budget cameras and lenses. They usually outsourced the manufacture of their lenses to Tokina and some other. Petri was known to use the universal M42 mount, briefly transitioning to their Petri bayonet mount (which wasn't popular and eventually died), and later in the 1970's back to M42 mount.

The Petri 55mm f/1.8 CC Auto (Tokina) we are featuring here is of the Petri bayonet mount. It took me more than a month to convert it for Nikon DSLRs waiting for the parts. Fortunately, once arrived, it was easy to figure a way to make it mount on Nikon and also to have focusing to infinity.

As a consequence of my modding the lens and the rear element, a vignetting was introduced, which at wide apertures like f/1.8 and f/2 appear as swirly bokeh. It was not intended but this is even better than the Helios because of the better image quality.

Mechanical-wise, and as many other users have complained, the internal mechanisms are VERY delicate and easy to break. Such was the broken aperture mechanism when it was bought. So naturally my fix was to permanently set it to f/2 -- because it's sharper, has better color saturation, does not glow when shooting outdoor where there's plenty of light, and still have the bonus swirly effect. I made samples and you can clearly see the benefit of f/2 over f/1.8.

Image quality starting from f/2 is superb, as mentioned above. It is already razor sharp at that stop, as if it was a macro lens, you can see details on my skin when shooting from a distance. A very surprising revelation for a lens made from early 1960s (circa 1963-1965). Even my old Nikkor-S 50mm f/1.4 made in 1967 was not that great until stopped down to f/8!

It has a bonus feature. An extra ring between the focus and aperture rings, which let you measure and calculate the Guide Number. But given the broken aperture mechanism, I don't need that at all.

Conclusion: It was a surprising revelation at f/2 how superb the image quality was, because frankly I wasn't expecting much for a single coated lens made in the early 1960s.



Petri 55mm f/1.8 CC Auto
(Petri bayonet mount)

Made by TOKINA
around 1963-1965

Focal Length
FX = 55mm
DX = 85mm

Minimum Focusing
0.6 meters

Filter Thread Diameter

Focus Throw
90 degrees

Aperture Run
f/1.8 - f/16 (6 blades)

Made in Japan

Petri 55mm f/1.8 CC Auto in Petri Bayonet Mount (TOKINA)



Shot with Nikon D5200

All samples are unedited/raw.

Most of my shots were at f/2.
You can tell which ones were f/1.8 by the glow and low contrast.
Swirly bokeh is very prominent at f/1.8





Petri 55mm f/1.8 CC Auto in Petri Bayonet Mount (TOKINA)



Photo Album

Converting the lens for Nikon DSLRs

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