I picked up this little lens yesterday at a local camera show and wondered if the lens masters could help with identifying exact type, date of manufacture, and coverage. Barrel reads Steinheil in Munchen No 40176 , focal length is ~24 inches. Front and back are symmetrical, the element diameter is 1 3/4" and inside aperture is 1 5/16". Each element is a cemented triplet. Overall length (with hood) is 2 1/4".
I'm assuming it's a wide angle aplanat because of the small size and my estimation of max aperture is F 18. Any help would be greatly appreciated.
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