Any future for my Canon EOS 650 lenses?

[Chris S]

I have an old Canon EOS 650 from the mid 80's. I spent a royal fortune on some really sexy lenses, including the 75-210mm zoom.

Anyone know of these lenses are compatible with the Canon EOS 40D body?

[darkpoint]

The short answer is:  Yes,

All EOS lenses work on the ner digital Canons, however, as the sensor is smaller than 35mm film, then there is a cropping factor of 1.6

So a 100mm lens behaves as if it was 160mm which is great for telephoto, but poor for wide angled stuff.

[harrumph]

...as the sensor is smaller than 35mm film, then there is a cropping factor of 1.6

Ooooh - so I suddenly have a 45-336mm zoom 

Now all I need is a digital body to put it on...

[Jaded]

120-336mm 

[andrew_s]

The short answer is:  Yes,

The exception is that some older non-Canon lenses don't work.

Canon didn't release the specifications of the earlier in-lens chips, so Sigma et al had to reverse engineer them for their lenses. Later versions of the Canon bodies worked a little differently. Everything was OK with old Canon lenses, but some older Sigmas (and possibly other brands?) wouldn't focus with the new bodies. For a few years you could get the Sigma lenses re-chipped, but that's done with now. I dare say Sigma made a single batch of the new chips, and they are all used up.