# References

[Kern Switar Lenses - C-Mount](https://cinematography.com/index.php?/forums/topic/796-kern-switar-lenses-c-mount/&do=findComment&comment=5838)

```
Kern / Focal Length (mm) / Hood Diameter (mm)

 

Switar / 10 / 33.5

Yvar / 16 / 33.5

Switar / 16 / 33.5

*Switar / 25 / (Not provided by Surgenor; my RX matches the Switar 16mm RX)

Pizar / 25 / 33.5

Pizar / 26 / 33.5

Macro Switar / 26 / (Not provided)

*Pizar / 50 / (Not provided; my RX matches my Switar AR 75mm)

Switar / 50 / 43.4

Yvar / 75 / 33.5

Macro Switar / 75 / (Not provided)

*Switar AR / 75 / (Not Listed; matches my Pizar RX 50mm)

Yvar / 100 / 33.5

Macro Yvar / 150 / (Not provided)

Yvar / 150 / 43.5

 

These 33.5mm diameters apparently correspond to the 32mm front thread.

 

Also, according to Chambless Cine Equipment, the Kern 100 group of zoom lenses, (POE, POE-4, and PTL), have an 85mm front thread.
```