Architect1776 Loc: In my mind

All your EF lenses (Even if they were bought for a EOS film camera) will work 100% fine on all your Canon APSC bodies with no adapter.
You camera will use EF and EFs lenses regardless of age and all the original functions of the lens will remain and no loss on the camera either.
So use the Elan lens and enjoy it on your APSC Canon camera.

Uncle Eddie

The Elan II has an EOS mount. And I've seen many Sears lenses with FD mounts, but have never seen one with an EOS mount.
Unless the camera or the lens has been modified, I wouldn't think it would work.
A picture of the lens mount would go a long way....

amfoto1 Loc: San Jose, Calif. USA

If the lens was used on a Canon EOS Elan II film camera, it must be an EF mount lens and there is no need for any adapter to use it on any Canon SLR or DSLR, including the APS-C camera models (which also can use EF-S lenses).

The only possible problem is if it's a third party lens... Sigma or Tamron in particular... sometimes older ones of those won't work properly on a more modern Canon camera.

If it's a Canon lens, it should work fine.

If you are accustomed to using the lens on that film camera, using it on a crop sensor, APS-C camera, it will "seem like" a longer focal length. For example, a 50mm "normal" lens on a film camera (or "full frame" digital), used on an APS-C format Canon camera will "act like" a short telephoto, like "80mm", making for a very nice portrait lens. The focal lengths don't really change... 50mm is still 50mm... they just behave differently.

There aren't really any "EF-S cameras", by the way. There are full frame and APS-C crop sensor Canon cameras. There are full frame EF lenses and crop sensor only EF-S. All Canon DSLRs have an EF mount and can use all the EF lenses. EF-S lenses use a variation of the EF mount that prevents them from being used on full frame cameras, but allows them to be used on the APS-C models they were designed for.

So you can use all EF and all EF-S lenses on a Canon EOS Rebel T7, SL2, T7i, EOS 77D, EOS 80D or EOS 7D Mark II (the current APS-C models). Basically any of the 125 million or so lenses Canon has made the last 30 years will fit and work, and so will many lenses that the third party manufacturers have made for use on Canon.

But the Canon 6D Mark II, 5D Mark IV, 5DS & 5DS-R, and 1DX Mark II (current full frame models) are only able to use the EF lenses. Even so, any lens that fit and worked on a Elan II must have been an EF lens.

EDIT: The "M" inside the rear lens cap must mean something else. For example, Sigma's logo looks a little like an M.

EF-M lenses have only recently been made... since about 2014 in fact. The Elan II film camera is 20 or 25 years older than that, I'd guess. EF-M lenses are STICTLY for use on the EOS M-series mirrorless camera models (currently M5, M6, M10, M50 and M100, I think). EF-M lenses will not fit or work on any of the SLR/DSLR EOS cameras. But if that lens is as old as you say, there is no way it is an EF-M lens.

ANOTHER EDIT: If the lens has an aperture ring (clicky thingy your rotate), and it says "MD" on that, it is probably a lens for Minolta MD-mount... which wouldn't fit and was never used on any EOS Elan II or any Canon camera made today or the last 30 years. There aren't even any adapters to use Minolta MD manual focus lenses on EOS cameras (or if there are adapters , it's not worth the trouble because they MUST use optics to correct the lens, which pretty much always ruins the image quality).

broncomaniac Loc: Lynchburg, VA

It is indeed a Sigma. A fellow identified it for me. Thank you for spending so much time educating me. It is greatly appreciated. Clearly it was never used on the Elan, as was indicated by the original owner. I suppose I have a fancy paperweight. But hey, it was free.

broncomaniac Loc: Lynchburg, VA

Much thanks to all who have helped.

amfoto1 Loc: San Jose, Calif. USA

Well, at least the price was right!

broncomaniac Loc: Lynchburg, VA

That it was.