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| p.1 #3 · Canon 100-300mm FD on the OMD |
the fotodiox ring has a ring on it. says lock and something else.
at the something else setting (sorry too lazy to look it up atm), the aperture is wide open making it easier to focus and compose. when you turn it to lock, the aperture is stopped down to what you have chosen so you can meter and set shutter speed.