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LENSTORATION: SMC Pentax-M 50mm f/1.4, Haze Between Cemented Lens Elements, Conversion to Nikon Mount

SMC Pentax-M 50mm f/1.4, Haze Between Cemented Lens Elements
SMC Pentax-M 50mm f/1.4, Haze Between Cemented Lens Elements


May 26, 2017

Here is an SMC Pentax-M 50mm f/1.4, a standard prime lens in Pentax K mount for Pentax cameras. It came in very bad condition because the rear glass had haze between the cemented glass elements, the paint was peeling off the body, and the other parts are very loose. My intention was to study this lens, but a pleasant surprise sprung up after the restoration/conversion.

This was my first ever Pentax lens, but it was very easy to learn the anatomy. Conversion to Nikon mount was also easy and straightforward but took much effort to achieve. Hey, it's not impossible if you keep believing!


SMC Pentax-M 50mm f/1.4



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Part 1: Cleaning the Haze

Before removing the haze, the lens appears to be sharp, but had very low contrast, pale colors and the highlights were bleeding/glowing. The haze in the lens actually looks like a built-in soft/diffusion filter (I have one of these).

SMC Pentax-M 50mm f/1.4, Haze Between Cemented Lens Elements
Remove the name ring first.

SMC Pentax-M 50mm f/1.4, Haze Between Cemented Lens Elements
It will lead you to this part.

SMC Pentax-M 50mm f/1.4, Haze Between Cemented Lens Elements
Unscrew these 3 pieces of screw on the side

SMC Pentax-M 50mm f/1.4, Haze Between Cemented Lens Elements
After loosening the screw, this will release the aperture plate

SMC Pentax-M 50mm f/1.4, Haze Between Cemented Lens Elements
Removing the aperture plate will expose the glass under it.
That's the only way you can remove this glass, not from the other side.

SMC Pentax-M 50mm f/1.4, Haze Between Cemented Lens Elements
Before cleaning

SMC Pentax-M 50mm f/1.4, Haze Between Cemented Lens Elements
Separation of cemented glass after heating the glass with water

SMC Pentax-M 50mm f/1.4, Haze Between Cemented Lens Elements
I used a dry bar of soap to erase the haze, like erasing white chalk on blackboard.
Toothpaste also works, but to a weaker effect. Rinse afterward.

SMC Pentax-M 50mm f/1.4, Haze Between Cemented Lens Elements

SMC Pentax-M 50mm f/1.4, Haze Between Cemented Lens Elements

SMC Pentax-M 50mm f/1.4, Haze Between Cemented Lens Elements

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Part 2: Repainting the Lens Body

Not the most beautiful paint job, but it gets the job done. This is a temporary fix and I might find other materials in the future.

SMC Pentax-M 50mm f/1.4, Haze Between Cemented Lens Elements

SMC Pentax-M 50mm f/1.4, Haze Between Cemented Lens Elements

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Part 3: Converting to Nikon Mount

Pentax K mount has a flange distance of 45.46mm, Nikon F has 46.50mm. The Nikon mount had a wider diameter than the Pentax mount, so it was shaved to fit. Holes were also drilled. Before that, there were two protrusions that had to be dealt with. The rest was smooth. After the Nikon mount was installed, there was little adjustment made to make sure it can focus precisely to infinity.

SMC Pentax-M 50mm f/1.4, Haze Between Cemented Lens Elements
Remove the original Pentax K mount.

SMC Pentax-M 50mm f/1.4, Haze Between Cemented Lens Elements
The original protrusions had been removed.

SMC Pentax-M 50mm f/1.4, Haze Between Cemented Lens Elements

SMC Pentax-M 50mm f/1.4, Haze Between Cemented Lens Elements
The Nikon mount was shaved to fit the smaller diameter Pentax mount.
Holes were also drilled for the screw.

SMC Pentax-M 50mm f/1.4, Haze Between Cemented Lens Elements
Now we have a Pentax lens that can directly mount on any Nikon camera and focus to infinity!

SMC Pentax-M 50mm f/1.4, Haze Between Cemented Lens Elements




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The Nikon D5200 as my weapon of choice.

Vintage lenses are my poison.

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