This lens was made for use with the Kodak Retina rangefinder cameras with interchangeable lens system. The back part of the camera lens stays in place and the front part of the lens after the shutter is taken of and replaced by a Wide-angle or telephoto lens. This can be done on the 1B / IIC and IIIC series. This was done in the perspective that the shutter and the diaphragm remained on the camera  so this  didnt cost a lot of money to make these lenses. The lens was sold in a plastic bubble where a part was the lens shade. This lens is made for use with Kodak Retina IIc (020) Retina IIIc (021), Retina IIC (029) , Retina IIIC (028) and Retina reflex (025)  which have a Retina -Heligon C f:2.8 or f:2 50mm standard lens.

Mount: Kodak Retina Rangefinder.

Optical construction: 9 elements in 6 groups.

Focus Type: manual.

Lens type: wide angle.

Filter size: Ø 58mm

Dimensions: 63x44mm

Weight: 55 grams.

Lens shade: Slide-on Ø 60mm

Condition exterior :    Nice no heavy users wear, clean and nice

Focusing :   With camera , this lens has no helicoid.

Bayonet :  Nice and clean  

Filter mount:  No dents no marks.

Glass :  Fine, no fungus, no marks no separation.

A part of the plastic bubble is the lens shade.