FD 300mm f/4.0 L - "Old" vs. "New

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I recently bought a Canon FD 300mm f/4L lens (and have been quite pleased with the results. This is the older breechlock mechanism as opposed to the New FD mount. I was wondering what the differences were between the New and Old version. i.e., is the optical formula the same, or is the only difference in the mount? Thanks.

-- T. Bruce Hudak (taass@hotmail.com), February 04, 2000


Both the FD and newFD versions of this lens have 7 elements in 7 groups. Everything seems to be the same, except the FD version weighs more.

-- Terry Carraway (TCarraway@compuserve.com), February 04, 2000.

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