I found this cinema projector lens on a flea Market, the seller had no idea what it was and gave it to me for 2 euros ... After some research i discovered that this lens is extremly rare and that the bokeh this 75mm f1.9 lens produce is the most amazing swirly bokeh i seen.

It was mounted using m42 hélicoïdal adapter + flat M42 to E mount adapter + a 3D printed ring to make the lens fit inside the helicoidal ring.

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