[Ian Nicholson]

Hi Ted,

I had the exact same problem. I had just acquired an EOS M, slapped on an FD lens adapter, put on the lens…

And the Record button didn’t work!

The answer lies within Custom Functions(C.Fn)

Go in and find

C.FN IV:Operation/Others
Release shutter w/o lens

and set to

1:Enable

I hope that helps!

Best regards,

Ian