There's a 180 Sironar (first generation, not the later N or S series) on eBay at the moment with a couple of unusual features: the Copal shutter is marked with a double aperture scale for use as a convertible, and the lens is engraved with "APO" on the rim. Does anyone know who may have originally marketed the lens in this form, and when?
http://cgi.ebay.com/Rodenstock-Siron...QQcmdZViewItem
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