[Scythels]

It was C mount from the film era.  based on the manufacturing documents I used to reconstruct it the spec was for about a 52 degree FoV (16mm film).  Super 16 would be something like 54-58 degrees based on my estimate and ultra 16 would be slightly more - maybe 60 degrees.  The lens isn't too too heavily vignetted (1-1.5 stops or so) so it would probably do okay on those formats as well.

[Brightcolours]

What I found is that it was a C-mount lens designed for 1/2 inch video tubes? That would then be for a recording area of about 6.4x4.8mm. 11 Size

 

In that usage it would then be equivalent to a 67.5mm lens on 135 format (not taking into account the different aspect ratios). For 16mm film it would then be equivalent to a 35mm lens on 135 format.

 

I believe the 1st commercial lens for photography with an aspherical element was the Canon FD 55mm f1.2 Aspherical. This lens still has a cult following keeping prices pretty high still.

https://www.flickr.com/groups/canon-fd-55-12/

It does much better wide open/close up than my FL 55mm f1.2, but its bokeh is not a real winner (depending on the distance).

[Scythels]

The As-specified semifield of view is 26.83 deg, or 53.66deg full-field of view.  Earlier I was moving between classes and rounded to 26 degrees mentally.  From the mapping function, this is equivalent to a 42.874mm lens for the 24x36mm image format. 

 

From MIR the 55/1.2 asph was released in 1971.  http://www.mir.com.my/rb/photography/com...50mmfd.htm

 

The 12/1.2 asph hit the market in 1956, 15 years prior.  The 12/1.2 was marketed as a cinema lens but saw wide utilization in other uses e.g military and photo due to its very high speed and relatively "wide" field of view.  At release it was the widest navitar available and the fastest by 1/2 stop.