I had already made a temporary brass lens hood for this large fast 1850's Waibl. But it didn't match the slightly later versions shown in the "austrian photohistoric index". They have the traditional flange with a thread matching a thread on the barrel, which means the diameter of the lens hood is more than a centimeter large in diameter.
There are occasional listings of large "orphan" lens hoods on Ebay. These are mostly with male mounting threads - the more modern way of mounting brass hoods. I bought a large male hood early in february, which would be big enough to convert for my purpose.
Co-incidentally, this hood must have come of a Suter Portrait Petzval no. 4 as it matches in everyway with the hood of this lens which I have!.
The cutting of the hole (thereby removing the thread section, was done with ordinary (PRC) saw, after a drill (1.5mm) created an entry slot. Slight adjustment with a file.
I was expecting to use small tracks of soft solder at 3 positions in order to cut some retaining sections of thread. However, the fit so perfect that it could just be eased on, with a slight flexing of the hood to compensate of ovality. It can only be removed now through flexing (compression) in a particular way. The flexing ability is made possible because the large diameter.
Time
bore holes - 5 minutes.
saw round the circumference - 10 minutes.
File the cut hole - 30 minutes.
All done when my wife was at a Ceramics Workshop to-day and she hasn't come home yet!
Now she is home!
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