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The Petzval Lens

My lens arrived! It’s actually a bit bigger than I was expecting and has a nice weight to it. There is no aperture control but there is a focus adjustment not shown by the photo.

I am assuming this is was is referred to as a Petzval Lens. According to wikipedia “The Petzval lens was developed in 1840 by Joseph Petzval. It consisted of two doublet lenses with an aperture stop in between. The front lens is well corrected for spherical aberrations but introduces coma. The second doublet corrects for this and the position of the stop corrects most of the astigmatism. However, this results in additional field curvature and vignetting. The total field of view is therefore restricted to about 30 degrees. An f-number of f/3.7 was achievable, which was considerably faster than other lenses of the time. The speed of the lens is ideal for portrait photography since the exposure time could be reduced.”

One drawback is I have no idea of the focal length or aperture even though it is wide open it would still have an aperture value. The lens is marked with Bausch & Lomb Optical Co. Rochester N.Y. 220523. If anyone has a way to identify this lens please let me know. I will be attempting to make a lens board for this lens to fit it in to my 4×5 view camera and hopefully it will give me some workable results.

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