Chuck
Thank you for the link on Series filters, and my apologies for doubting you.
Now I am wondering why Olympus put a thread for a Series VI retaining ring on
some front standards of the Auto Bellows. A standard filter thread would make
sense, but why a thread for a retaining ring when there is nothing to hold the
filters in place?
--
Alan Wood
http://www.alanwood.net (Unicode, special characters, pesticide names)
----- Original Message ----
> From: Chuck Norcutt <chucknorcutt@xxxxxxxxxxxxxxxx>
> To: Olympus Camera Discussion <olympus@xxxxxxxxxxxxxxxxx>
> Sent: Thursday, 8 January, 2009 22:20:02
> Subject: Re: [OM] OM Bellows Questions
>
> Thanks, Alan. I could certainly be wrong about Series filters but the
> information I consulted before responding describes series filters as
> without threads.
>
> Originally they were designed to have a cell that would accept the
> filter and mounting threads on the back of the cell to match a
> particular camera's own threads. For example, for a 50mm Zuiko with
> 49mm threads you would have a Series VII cell with 49mm threads on the
> back. It would be called a step-up ring since a Series VII filter is 2"
> in diameter and (at 50.8mm) larger than 49mm. The filter would then be
> held into the cell by installing a Series VII retaining ring which has a
> 2-1/8" thread. The retaining ring in some cases might even have it's
> own front thread for attaching yet another filter.
>
> But that, I suppose, is how Kodak envisioned it. I'm sure there might
> have been many, many variants produced over the years. Including (as my
> link describes) the introduction of lenses that were directly threaded
> to Series sizes to avoid the need for an adapter.
>
> Chuck Norcutt
>
--
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