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Nour triplet 64mm f2

Kickstarter

Cooke triplet with bokeh ( ie spherical aberration) control





Vimeo

Is it actually a thambar lens ?

Front glass with center mirror spot

The spherical aberration of the lens was produced primarily at the outer perimeter of the lens.  Stopping it down to smaller apertures would reduce this effect and it was totally eliminated at f/9.  

To further enhance the soft focus effect, the lens came supplied with a special, clear filter that had a one centimeter mirrored spot in the center which eliminated the sharp image created by the center of the lens.

Reference:

Thambar lens

Phsc ca

 J travnik on apodization filter 

Mobile 01

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