Hi, I have a large brass Dallmeyer Triple Achromatic Lens and was hoping someone would be able to tell me more information about it. All the pictures and info I could find on the Triple Achromatic Lens says that they were an F10 lens but this one is a F3.5. It has a focal length of 11.5 inches and the glass diameter is 3.3 inches which comes out to about f3.5. The front lens group goes deep into the lens body and looks to hold both the front and middle lens groups. Looking at the Vade Mecum I do see a description of a f4 Group Lens which they say is a faster version of the Triple Achromatic. This lens is f3.5 but could this be another version of that lens? Another interesting thing about the lens is there is no serial number on the barrel. If anyone could shed some light I always enjoy a lens mystery being solved. Thanks.
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