What is a pi-Alphex?

[Jim Rice]

I've seen references but no actual definition.
Thanks, ~j

[Ralph Barker]

It's 3.14 shutters in one? ;)

I'm not sure what the pi was intended to represent, but it's a smallish Alphax shutter. I have an old Wollensak 75mm lens mounted in one.

[Jim Rice]

How might one distinguish it?

[Ralph Barker]

By their roundness? ;)

on a 110mm Toyo board:http://www.rbarkerphoto.com/misc/Photo-gear/Pi-Alphax75mmWolliOscilloRaptar.jpg

[Paul Fitzgerald]

Hi there,

It seems to be the late model after 3M bought Wollensak, I guess just a name change. I had one with a 380/5.6 Tele-Optar a long time ago.