No apologies required since I don't really know what I'm talking about.
But perhaps we're barking up the wrong tree thinking of re-using our
49mm filters. If the thread is truly Series VI (and I think it could be
because I measured it at 44.xx mm inside the thread) then the logical
(and standard) arrangement for series filters would be a step-up ring
from Series VI to Series VII. That was a common item of the day. But
Series VI to 49mm might also have been readily available then even if
not common.
Still, it bothers me that the thread pitch seems extremely fine for a
filter thread and it especially bothers me that this doesn't seem to be
documented anywhere. Furthermore, while it might be convenient to have
another filter mount ring for use with a reversed lens there's no reason
you can't have your 49mm filters installed on the front of the lens even
though the lens is reversed. The bellows connecting ring fits easily
over my 49mm filters.
Chuck Norcutt
Alan Wood wrote:
> 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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