"murrayatuptowngallery" <murrayatuptowngallery@[EMAIL PROTECTED]
>
wrote in message
news:1193118450.275682.327550@[EMAIL PROTECTED]
> It arrived today.
>
> I learned it has a Waterhouse slot, 2 air cylinders and
> springs that
> look as modern as any (I guess I never really thought
> about helical
> tension springs looking the same).
>
> Number (serial?) on the back, nothing identifying the
> shutter it yet.
>
> f/stop scale marked 6.2 - 45, so it must be newer than US
> stop
> style..but Waterhouse stops certainly SEEM older than
> 'real' f-
> numbers.
>
> The scale about the f-stop scale must tell something about
> the
> Waterhouse stop required, otherwise I don't see a point to
> labeling
> the lens body if the Waterhouse stops are individually
> marked and
> spend more time external to the lens than part of it.
>
> I'm easily impressed - little lenses that throw large
> images.
>
The shutter could be any of several. One of the
cylinders is the speed regulator, the other to trip the
shutter with an air hose. It should have a hose fitting on
the bottom.
If it has a stop scale it must once have had an iris
diaphragm. A slot may have been cut later for Waterhouse
stops. About the only lenses I know which have both an iris
and a slot are process lenses where the slot was used for
special stops for process work or for filters.
If this is a standard make shutter it may be possible to
fit the cells into a newer shutter made by the same company.
US stops are calibrated in terms of relative exposure
time but are otherwise arbitrary. US-16 is the same as f/16
so US-8 equals f/11, US-4 equals f/8, etc. The stop scale
could be for either system but, assuming the lens is some
variation of the R-R lens its likely to be US stops.
--
---
Richard Knoppow
Los Angeles, CA, USA
dickburk@[EMAIL PROTECTED]
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