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September 8, 2017: Reverting the Petri 55/1.8 Back to f/1.8, Swirly Bokeh


Reverting the Petri 55/1.8 Back to f/1.8, Swirly Bokeh
Reverting the Petri 55/1.8 Back to f/1.8, Swirly Bokeh



08 September 2017

The Petri 55mm f/1.8 CC Auto (TOKINA) originally has a Petri bayonet mount, its flange distance similar to Pentax. With a little bit of engineering and moving the rear optics, this lens can now mount on any Nikon film or digital SLR and precisely focus to infinity.

As a consequence, a vignetting was introduced, resulting in a swirly bokeh that is similar to those Helios 44 lenses. Only that the Petri has the advantage of better color saturation, contrast and sharpness wide at f/1.8 (which is even better at f/2).

So days ago, I have permanently fixed the lens at f/2 due to its broken internal aperture mechnism when I bought it. Having seen a swirly bokeh effect yesterday, maybe it won't hurt to revert it back to f/1.8 to see how prominent the effect would be.

A 'swirly bokeh' effect is caused by vignetting, and this proves that you can introduce the swirly effect even to lenses that do not natively have this effect.

The swirly bokeh effect by the Petri is as prominent as the Helios 44-2 I previously owned, but better. Anyway, I have put it back to the f/2 opening for better sharpness, free from glow, and better flare control at that stop.


At f/2...

Reverting the Petri 55/1.8 Back to f/1.8, Swirly Bokeh




At f/1.8...








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