Wollensak 190mm Enlarging Raptar information

[Christopher Keth]

Good evening. I just purchased this lens quite cheaply and would love to try it as a taking lens. Does anyone know, or know how I can find out, the thread size and pitch to mount this beast? I can only estimate it and the threads are quite fine, beyond my ability to accurately measure.

[Michael Gudzinowicz]

These are specs for Wollensak shutters that may match your cells.

Front Front Rear Rear Flange Flange Front/ Maximum
Maker Thread Thread Thread Thread Thread Thread Rear Iris
Model Diam. Pitch Diam. Pitch Diam. Pitch Dist. Opening
(in) (in) (in) (in) (in) (in) (in) (in)
(mm) (cm) (mm) (cm) (mm) (cm) (mm) (mm)

Wollensak

No. 0 0.838 50.0 0.838 50.0 0.953 40.0 0.710 0.552
21.3 19.7 21.3 19.7 24.2 15.7 18.0 14.0

No. 1 1.059 50.0 1.059 50.0 1.185 40.0 0.808 0.710
6.9 19.7 26.9 19.7 30.1 15.7 20.5 18.0

No. 2 1.204 50.0 1.204 50.0 1.325 40.0 0.827 1.024
30.6 19.7 30.6 19.7 33.7 15.7 21.0 26.0

No. 3 1.764 40.0 1.764 40.0 1.997 30.0 0.946 1.380
44.8 15.7 44.8 15.7 50.7 11.8 24.0 35.1

No. 4 2.389 40.0 2.389 40.0 2.623 30.0 1.024 1.761
60.7 15.7 60.7 15.7 66.6 11.8 26.0 44.7

No. 5 2.901 40.0 2.901 40.0 3.128 30.0 1.024 2.233
73.7 15.7 73.7 15.7 79.5 11.8 26.0 56.7