[raymond003]

I have a few old lens For Canon EOS 650
it is Sigma and Taronm lens.
can it apply for 300D?

[raymond003]

The lens are
Tamorn AF28-80mm lens
and Sigma 70~210mm lens

[loyukfai]

Not sure if they work but read before that for some 3rd parties Tamron and Sigma lens, they will provide something called "re-chip" service for older lens in order to use on newer models if they don't work as expected.

You may have to call the distributor for details.