By comparing the diagrams of similar optics from different manufacturers, it is not difficult to see that they are very different (even those popular 50mm). I would be very surprised when 2 designers came up with the the exact same lens arrangement (both diagrams are identical in this case) when they were not copying each other. Is it possible, yes, anything is possible, but highly unlikely. The optics might be fine tuned slightly, but they even look the same when the lenses are extended to closest focus. But geez, I must be stupid to think that way, I know.

Alan Chan
http://www.pbase.com/wlachan

I haven't looked at the diagram for these lenses... but a lens diagram that contains a figure for each element and does not have precise measurements, curvatures and more than I care to mention, amounts to nothing but a pretty picture if you're trying to determine if two lenses are indeed of the exact same design.

It's like drawing a top down diagram of a 4-door, 4-cylinder, 4-wheeled automobile. They'll all look the same.

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