Longest Heliar in a modern #1 shutter

**Steve Clark** · 31-May-2007, 07:50

Does that Compur #2 have a flash sync?

**Ole Tjugen** · 31-May-2007, 08:44

Originally Posted by Steve Clark

Does that Compur #2 have a flash sync?

It has a PC flash contact, so I would assume it does.

That kind of #2 shutter was introduced in 1953, with X-sync right from the start.

**Alex Tymków** · 31-May-2007, 14:56

Hi
I have a 1920s 150mm ƒ4.5 Heliar in a No 2 Compur dial set shutter, of course no flash synch. I tried to fit the front element into a rimset 1970s Compur shutter and it wouldn't fit - very nearly but it was slightly too small. They must have changed the thread after mine was made. I'm sort of relieved in a way as I have just had a Wista lensboard drilled to take the No 2 shutter. The lensboard plus drilling cost more than I paid for the lens plus shutter. Cleaned up the lens and found a chip in the front element, took some pictures, so we shall see.
Alex

**Steve Clark** · 1-Jun-2007, 10:04

Thanks much for all the help. One other thing, should the front and rear serial numbers match? or not necessarily. Thanks again, Steve

**Ole Tjugen** · 1-Jun-2007, 10:08

Originally Posted by Alex Tymków

Hi
I have a 1920s 150mm ƒ4.5 Heliar in a No 2 Compur dial set shutter, of course no flash synch. ...

That's not a #2, it's a pre-standardisation "oddball". The #2 was only introduced as a defined size in 1953.

**Alex Tymków** · 1-Jun-2007, 14:56

Steve
The numbers on mine do match, I'm not sure of the significance, if any, if they don't.
Ole
They certainly are "odballs". I have another Compur from the same era which has a 49mm mounting thread as opposed the 45mm with the Heliar. I think we forget that standardisation in most things photographic only happened post war.
Alex