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renes
18-Aug-2011, 06:12
I try to find measurements for Betax No.2 shutter but can not spot it. I need to know 'front lens thread', 'back lens thread', 'mounting thread' and 'iris (Max)'.

I found in Wollensak old brochure only this: "Light opening" - 1", "Lens opening" - 1 7/32" but I am not quite sure what they refer to. I will appreciate any help.

Jon Shiu
18-Aug-2011, 06:29
Hi, light opening would mean maximum aperture. Lens opening would mean thread size for screwing in the elements.

note: one odd thing I've found with these no. 2's are that the cable release tip gets jammed in the socket due to getting stuck beside the inner lever. Perhaps cable release's were thicker in the olden days.

Jon

domaz
18-Aug-2011, 07:10
This link (http://www.suaudeau.eu/memo/pratique/Les_obturateurs_centraux.html) is in French but it has most of what you need.

renes
18-Aug-2011, 07:57
Thank you gentlemans!

Still nowhere about mounting thread. Anyone of using Betax No.2 who could measure it?

Jon Shiu
18-Aug-2011, 08:00
Look at the column "Bague de montage"

Jon

Darren Kruger
18-Aug-2011, 10:47
I try to find measurements for Betax No.2 shutter but can not spot it. I need to know 'front lens thread', 'back lens thread', 'mounting thread' and 'iris (Max)'.

From an old Wollensak pamphlet I have:

Front Lens thread: 1 7/32" (~30.96mm)
Back lens thread: 1 7/32" (~30.96mm)
Mountaing thread: 1 21/64" (~33.73mm)
Iris (max): 1" (25.4mm)
Length: 7/8" (~22.23mm)

Please note that a Betax No 2 shutter has the same thread measurements as an Alphax No 2 shutter.

-Darren