[LargeFormat] to ringlash or not to ringflash

[Scot]

Question:

I purchased a Tominon 75mm lens with a Copal/Polaroid shutter in my search
for cheap learning lenses for my 4x5. The lens came with a ring flash setup
from a Polaroid CU-5 Land Camera. Everything on the flash looks in good
shape but there is no power source. Anyone have any ideas what I could use?
Scot
----- Original Message -----
From: "Clive Warren" <cocam@blueyonder.co.uk>
To: <largeformat@f32.net>
Sent: Tuesday, March 26, 2002 4:51 AM
Subject: Re: [LargeFormat] to ringlash or not to ringflash


> At 8:49 am +0000 26/3/02, Robert Lawrence wrote:
> >"philip.lambert" wrote:
> >
> >>  I am currently worrying
> >>  whether a bulb flash will damage a modern SLR when the shutter
triggers the
> >>  flash.   All comments welcome on this. Philip
> >
> >There are some delicate electronics in this path on a modern SLR,
> >certainly not
> >designed to sink/source the current for a flash bulb, the sync socket is
NOT
> >mechanical as on LF shutters and you will almost certainly fry your
camera
> >unless you isolate the two circuits.
> >
> >Robert Lawrence
>
> This reminds me of a Speed Graphic overhaul I carried out a long time
> ago. The shutter was a bit erratic so I stripped it down. The flash
> contacts in the shutter mechanism are simple but effective and made
> of brass. In this camera the  brass strips had been "blown apart" by
> years of firing off Press flash bulbs and the detritus was jamming
> the shutter every so often!
>
> It could be a good way of getting rid of those irritating auto
> functions in modern SLRs, such as focus and metering ;-)
>
> Some older SLRs may be designed for use with flash bulbs in addition
> to electronic strobes but not all were designed equal......
>
> Cheers,
>         Clive
>
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