Universality of spacer ring and retainer ring

[wsit]

Hi

I was lucky enough to acquire a mint xenotar 150mm 2.8, but it does not come with any spacer and retainer ring. It came with a silver ring copal 3 shutter.

I took the spacer and retainer from my other copal 3 lens and it seems to fit. So my question is if the spacer and retainer ring are interchangeable between different lens but the same shutter model.

Leon

[Jim Noel]

If your current lens requires the spacers to be accurate, yes. If not, NO!
The diameter may be appropriate, but the thickness is at least, possibly more, as important.

[wsit]

Can you explain like I am 5 why the thickness matter? I would like to understand better

[cowanw]

Are you asking about the mounting spacer ring. This has no effect on function. Jim may be thinking of spacers associated with the elements within the shutter.

[wsit]

I am asking about the mounting spacer.

[Jim Noel]

Yes, I am thinking of spacers between lens elements and shutter.

[Keith Pitman]

You can usually find the spacers and retaining rings on Ebay.