Vivitar 400mm 1-5.6 77mm

Friend gave me this lens, need to know what camera it fits, as its not a Cannon or Nikon lens

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Looks like Canon FD mount to me.

Well we have a Cannon EOS Elan7ne and it does not fit.

peter k. said:

Well we have a Cannon EOS Elan7ne and it does not fit.

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That's because an elan7 is Canon EF mount, not FD mount.

Oh that makes sense, the Nikons digital D-90 we have will also take the my old film lenses, but evidently not Cannon.
Hmmm... would love to use it, will have to check and see if there is an adapter we can get so it would fit the Nikon

peter k. said:

Well we have a Cannon EOS Elan7ne and it does not fit.

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Canon - one N. it's certainly not a cannon lens...

As said the EOS series has an EF mount. The FD mount cameras preceded those; the last ones were the Canon T-series (T50/70/90) and the still popular Canon A-series. Those are manual focus systems exclusively.

There's no practical way to use this lens on a modern EOS or Nikon camera. There are adapters that allow them to be used on modern mirrorless digital cameras.

peter k. said:

will have to check and see if there is an adapter we can get so it would fit the Nikon

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Don't bother.

Yep, Canon changed it mount when for AF. Nikon and Pentax maintained their mount Minolta also had a complete new designs. The film to flange distance is very different, Canon did make an adapter for FD to EF for the L telephotos which used a glass balance, you might be able to find one. Other wise a Canon FD body can be had for not much money, look for working. Here is an ebay link to a FD to EOS adapter. the issue is that some will not allow for focus to infinity. Other issue is that an adaptor with glass balance will act as a teleconverter.

Paul Howell said:

the issue is that some will not allow for focus to infinity. Other issue is that an adaptor with glass balance will act as a teleconverter.

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...and a further issue is the lack of aperture control, which means stop-down metering only.