Weird Wirgin Edinar

I have a Wirgin Edinar 105mm f/6.3 That I can't find any reference to. My problem is that the aperture selector goes significantly past its stops and I don't know what side of the selector is the indicator. The aperture continues to dilate and contract past the stops as well. Not really sure what to do. Would also love to know how much farther than f 32 it goes. Any help is appreciated.

https://imgur.com/a/bc8n18M

I got such shutters too. Concerning the opening feature, you should see when the diaphragm disappears. I assume it actually does so at 6.3 .
Concerning the closing feature, you could meter at the film gate and thus calculate a figure for the end position of the aperture setting.

I have a Wirgin Auta (similar, 6x9 with 6x4.5 masks) with f/4.5 lens -- I've always used the small edge of the aperture tab with good results.

Wirgins are very rare around here.

As concerns going beyond 6.3. Shutters (including diaphragm were designed and made by just a few companies for a larger number of camera brands. The optics design had to fit with the threaded apertures for the front and rear groups. So, Messrs Gauthier or Deckel would not design a special shutter assembly for a camera with 6.3 max aperture, rather, a "universal" model allowing for , maybe f:4.5 or f:3.5.
As concerns the index: like Donald Qualls said.

bernard_L said:

So, Messrs Gauthier or Deckel would not design a special shutter assembly for a camera with 6.3 max aperture, rather, a "universal" model allowing for , maybe f:4.5 or f:3.5.

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Also worth noting that the same shutter that would hold an f/6.3 or f/4.5 105 mm lens would hold an f/2.8(ish) 50 mm lens; one that accepts an f/3.5 at 105 will hold a 50 mm f/2 Xenon (as on my Weltini, with the same physical size shutter as my Moskva 5). The shutters were built for actual pupil diameter, thread size, and group flange spacing, lenses were mounted to accommodate the shutter, and aperture scales were engraved or painted on to fit what the actual apertures would be for the mounted lens.

AgX said:

I got such shutters too. Concerning the opening feature, you should see when the diaphragm disappears. I assume it actually does so at 6.3 .
Concerning the closing feature, you could meter at the film gate and thus calculate a figure for the end position of the aperture setting.

Click to expand...

The iris actually keeps opening past the 6.3 position.

So just calculate the f-stop based on the difference in the light hitting the meter? Half as much = 1 extra stop? I figured I would put the indicator right in the middle on 6.3(more wiggle room there) and then measure the difference between that and the end of the closing.

Bobconan said:

So just calculate the f-stop based on the difference in the light hitting the meter? Half as much = 1 extra stop?

Click to expand...

Yes.