[LargeFormat] 9 1/2" Dagor

[philip lambert]

Presumably when your lens is wide open the iris has an opening of 1.4
inches; this is 9.5 divided by 6.8.  On this basis f16 would be 0.6 inches
diameter. You can work out the size for f22 and f32.  Apply a cardboard
strip to the shutter alongside the iris lever and mark the scale position at
these various apertures. Maybe you could hen varnish the surface of the card
with clear lacquer.  If you can work with a strip of alloy and a cheap
engraver tool it might look less home-made.  I used a Dymo tape on a
government lens/shutter I bought 30 years ago that had left its aperture
scale behind on the instrument it had been fitted to.  Anybody who is into
graphic art could draw a scale on a computer and print it (not me then).
Experiment with exposure after this.  You might care to get the shutter
speeds calibrated. I use a Calumet device and often find shutters running
half a stop slow (except Copals).  The point I am making is a slight
inaccuracy in the aperture calibration is likely to be insignificant
compared to speed inaccuracy.
Incidentally as I said a few times before, a lot of sleepy shutters can be
improved by taking the glasses out of the shutter and standing the shutter
in a closed jar on a layer of pennies into which some lighter petrol has
been poured. Keep the shutter above the petrol line. One of my small
SynchroCompur shutters had lost all its slow speeds and they were restored
by this means.  Philip
----- Original Message ----- 
From: "Larry J Schaaf" <ljs@verizon.net>
To: <largeformat@f32.net>
Sent: Friday, October 17, 2003 12:56 AM
Subject: [LargeFormat] 9 1/2" Dagor


> Help!  I have a 9 1/2" f6.8 Dagor in an Ilex No 3 Acme
> shutter.  Unfortunately, the f/stop scale is missing - it is the
> kind that is an arched flat plate that mounts on the face of
> the shutter with two screws.  Can anybody provide a scan
> of theirs so I can make up a replacement?  A while back
> David Galway of Ontario posted a notice that he was
> replacing such a shutter with a Copal - by any chance
> does he still have his old scale?  or any other suggestions
> most appreciated (Grimes would cost too much)
>
> thanks
> Larry
>
>
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