Originally Posted by
LabRat
Your measurment are fairly close, but not exact;
Ring OD is about 78mm
Ring is about 3.2mm wide gap
Board thickness can be about 1.5mm on earlier, but also 1.8mm on next later model board....
Ring depth is about 0.5mm, but shouldn't be critical as just felt sticks into gap...
It is about 18mm from top to ring top...
Outside is about exact what you posted...
So that we can help you, do you know exactly what camera era you have, are you trying to buy or make lens boards, trying to adapt something, etc???
My camera is an early III, (1951/52) that uses the thinner boards, but have adapted the thicker boards with a little filing, as I have found boards over the years that could fit... The thicker board camera also has a little triangle cut out on the bottom edge that prevents the thin boards from seating in the bottom FS holder lip, then they changed the light trap seat to a ring that enters the camera FS they still use today...
I think the CameraQuest site has a detailed description of the camera styles, and you should exactly ID your camera, and the picture of the lensboard might be a little different than what you exactly need... Or post you serial # here so Bob can date it for you, but still finding exact lensboards can be tricky if you don't know exactly what to look for... Making them is not hard, except they are thin, and need a good milling machine to cut the gap evenly, and a way to hold the thin material flat and without bending...
Hope this helps you!!!
Steve K
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