t._bruce_hudak Posted February 4, 2000 Share Posted February 4, 2000 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. Link to comment Share on other sites More sharing options...
terry_carraway Posted February 4, 2000 Share Posted February 4, 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. Link to comment Share on other sites More sharing options...
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