I first and foremost bought this lens for the speed, but fast lenses do not equal great bokeh. Don’t get me wrong, it is a fun lens to use, and it’s special because of the fast speed. For me the bokeh at some instances, especially when the subject is placed far away from the lens it becomes too busy at the edges. It goes from a more normal oval shape to a triangular shape, which in my mind is not ideal.


Basically to achieve infinity focus with a mirrorless camera you have to remove a large part of the lens barrel. The barrel extrudes from the optical section so it is a straight forward job, you frankly don’t need a lathe or anything specialised tools to do this. The backside is not visible so I just used a normal metal saw to remove the barrel section that extrudes from the lens. Normally you have to glue the back element back in, but because I used a handheld metal saw the two parts were fused together like glue. With this it is straightforward for the rest of the adaption process, you need a 52.5mm clamp adapter to something larger than 52.5mm. I used a M65 adapter and a M65-M65 helicoid, and the usual step up rings and slim M42 to E-mount adapter.


These are the parts I used to do the adaption

  • 52.5mm to M65 clamp adapter from RafCamera
  • Generic M65-M65 focus helicoid
  • Generic 42-65mm step up ring (0.75mm pitch)
  • Generic super-slim M42 to E-mount adapter

Lens Characteristics

For being a f/1 it’s not expected to be a sharp lens, but credit where credit is due, this is not the most unsharp lens I have tried. This was meant to be used on a 16mm film projector, so it is not totally fair to complain about sharpness.

The image circle is tiny even compared to most other 16mm film projection lenses, not being able to cover a normal APS-C sensor at infinity. Then again I wouldn’t usually shoot at infinity with a projection lens, so in most cases it will cover an APS-C sensor.

Chromatic aberration is a normal problem for projection lenses, this lens is not the exception. There is a strong blue and purple aberration on high contrast edges and it can be tricky to control this. It is so strong that Lightroom is having a hard time trying to mitigate the effect.

The lens also has trouble controlling the lens flares, even when being in the shade. The bright sky reflecting into the lens can be enough to have a substantial loss in contrast at the bottom half of the image. So mounting a lens hood would be helpful in this regard.


I have mixed feelings about this lens, it is fun to use, and shooting at f/1 is always an event for me. But I keep coming back to the same thought, that I only use this lens because of the f-stop and not the lens characteristics itself. The lens is special only because of the f-stop, in my opinion.


  • Ultra-fast
  • Fine for portraiture
  • Easy to use


  • Covers only APS-C
  • Unsharp
  • Not great flare control
  • Chromatic aberration
  • Triangular and busy bokeh
  • Destructive modification