Minor nitpick: Unless you're referring to prototypes or maybe FD-EF conversions (like the famous The EF system is not quite that old; but still, at over 20 years old (1987) it is amazing how much development they seem to have crammed into that space of time. Yet, as you say, the old lenses are still good.scalesusa said:EF lenses from the very first ones in the 1970's are still in use on DSLR's today
Personally, I think the only limitation of older lenses is, generally speaking, autofocus. I enjoy using my TS-E lenses but they would be a handicap in most wedding situations - though they could be put to good use for staged photos, like the traditional wedding party lineup photo, and some newlyweds have asked their photographers to use the defocus capability of TS-E lenses for more dramatic couples photos.
I think that, as scalesusa seems to be saying, if you are thinking in terms of how close you can get to the right subject framing for a given focal length, you may need to rethink your movement during the wedding. It seems apparent to me that the 70-200mm f/2.8 will help some of these problems, of course, since you don't need to be very close. A shorter lens requires you to be close by. So, it might be in order to find out what sorts of venues are common for weddings, and experiment a bit with rentals if you can.
Personally, I don't know what wedding photog etiquette is, only just don't do this and become the subject.
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