BETAX No.2 shutter info help please

[renes]

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 Ø (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]

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]

This link (http://www.suaudeau.eu/memo/pratique/Les_obturateurs_centraux.html) is in French but it has most of what you need.

[renes]

Thank you gentlemans!

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

[Jon Shiu]

Look at the column "Bague de montage"

Jon

[Darren Kruger]

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 Ø (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