B.S.Kumar
13-Feb-2016, 08:33
I bought this very nice looking lens in a brass barrel. There are no markings anywhere to indicate the focal length or the maker's name. I hope someone knowledgeable will be able to answer a few questions I have. The focal length appears to be around 180mm, and the image looks quite sharp on the groundglass. It appears to cover 4x5 quite well. Apertures are marked from f/11 to f/64, and the iris moves smoothly. The glass is flawless.
1. As you can see in the 3rd photo, the aperture is physically prevented from opening fully. I know that some lenses have a baffle to prevent people from using the lens below the stated performance. But I've not seen this in older lenses. This lens could easily go to f/8, or maybe even 6.3. Why would it have been done?
2. The lens could probably be mounted in a Copal 1 lensboard. There does appear to be a flange, but it looks like it is painted over, so it is stuck. How can I release the flange without damaging the surface of the barrel? Would paint thinner work?
3. Can anyone identify this lens? There are no swirlies, so it's not a Petzval. Rapid-Rectilinear?
Thanks,
Kumar
146510146511146512146513
1. As you can see in the 3rd photo, the aperture is physically prevented from opening fully. I know that some lenses have a baffle to prevent people from using the lens below the stated performance. But I've not seen this in older lenses. This lens could easily go to f/8, or maybe even 6.3. Why would it have been done?
2. The lens could probably be mounted in a Copal 1 lensboard. There does appear to be a flange, but it looks like it is painted over, so it is stuck. How can I release the flange without damaging the surface of the barrel? Would paint thinner work?
3. Can anyone identify this lens? There are no swirlies, so it's not a Petzval. Rapid-Rectilinear?
Thanks,
Kumar
146510146511146512146513