by ʇolɐǝz ǝɥʇ qoq

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I have a Canon FD-mount lens and a Nikon pre-AI lens, with respective adapters.

I attach the FD lens to my EOS M, set the camera to M or Av mode, and the aperture is fixed at 00. When I press the shutter button, it doesn't fire.

How do I use these vintage lens on an EOS M?

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In Custom function menu: C.Fn-7 Release shutter without lense: on

The shutter can release.

It can shoot in either mode, including P, AV, TV, M. In TV mode, set ISO to auto. ISO becomes a variable according to time and aperture you set.

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This was very helpful. One side note. You must have not NOT set on green "a" setting (at shutter button) otherwise you wont see "custom settings (c.fn) - – user36847 Jan 7 '15 at 20:36

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