What cells belong with this shutter?

[Robert A. Zeichner]

I have an old Rapax shutter with an f-stop scale for three focal lengths: FL's are 8-1/4", 12-3/4" and 15-1/2". This also has the orginal mounting flange. What a nice sounding shutter! I wish I had the cells it was set up for. Any information you can provide on this would be welcome.

[Michael Gudzinowicz]

It probably was used with a Velostigmat Ia or Raptar Ia triple
convertible lens. See the following links for some of the specs.
If you can find the cells, check the thread diameter and pitch,
and the between cell spacing.

http://www.cameraeccentric.com/html/info/wollensakcat/seriesia3.html
http://www.cameraeccentric.com/html/info/wollensakcatd/ia.html

[Robert A. Zeichner]

Thanks Michael, very helpful information.