OMD-EM-1 and DSLR lenses

[walter.sk]

My wife is considering a switch to the OMD-1 from the Sony Alpha DSLR system.  She has a Sigma macro lens (for full-frame) with the Alpha mount.  Is there an adapter that would allow that lens to work on the Oly?  Would AF be possible (not a neccessity with the macro lens, but she has some other Alpha-mount lenses)?

[Vladimirovich]

OMD-1

OM-D E-M1 (ц) your grammar nazi

She has a Sigma macro lens (for full-frame) with the Alpha mount.  Is there an adapter that would allow that lens to work on the Oly?

yes

Would AF be possible

no, MF only (w/ magnified view and/or focus peaking

[walter.sk]

Thanks for the "grammer" correction.  Would she be able to use autoexposure?

[Vladimirovich]

Would she be able to use autoexposure?

you don't have any aperture control from the camera - that means you are metering @ actual working aperture (not like metering wide open and then stopping down to take a shot) - so your metering is always what it actually is...