I'm looking to get a Minox A, not for a collection, but to take pictures with. <p> Heckmann's book states the COMPLAN lens was color corrected in the mid 1950s." This implies the original lenses suffered more from chromatic abberation. Does anyone know at what Serial Number this change was made? <p> Also, Heckmann says "since about 1962" the window protecting the lens was made of UV filtering glass. Does anyone know at what SN this change was made? <p> Lastly, has anyone any experience as to whether these changes made any noticeable improvement in the pictures taken?