Hi
I don't know how to pick one from another, but if it helps:
serial numbers
Canon Y816 (and its a new FD lens)
Olympus 3418677
both are quite recent looking examples (he says about old lenses
)
about the EF 50 and the FD 50 I think you are right (my wrong assumption)
Canon website says:
Marketed June 1979
Lens Construction (group) 4
Lens Construction (element) 6
No. of Diaphragm Blades 5
Minimum Aperture 22
Marketed March 1987
Lens Construction (group) 5
Lens Construction (element) 6
No. of Diaphragm Blades 5
Minimum Aperture 22
number of lens elements has remained the same but grouping is at least reported differently.
* Why not develop a sort of model for the testing making it possible for people to ad their lenses if they want to (some seem eager to do so already posting samples
)? If done I think flare and bokeh are as interesting as contrast and resolution. They are hard to compare at different set-ups but one could try...
I think this is a good idea and I'd like to work with it. There are some issues which need to be sorted out however.
I think natural targets are superior to artificial ones (and we can all get MTF curves if we wish for them) but to make comparisons straight forward I think that the scene and lighting needs to be the same for each lens. This kind of drags us back to studio setups and models.
Now either the lenses all need to come to the testing location (to use the same test setup) or the test setup needs to be replicated at each location.
I see quite a few obstacles in that path.
Once they are solved then RAW could be sent (or standard crops from TIFF generated using dcraw) and I'd be more than happy to work out how to host something such as the large format scanner comparison (
here).