Lens type for 77D: EF, EF-S, EF-M?

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MikeB2000 New Member • Posts: 20
Lens type for 77D: EF, EF-S, EF-M?

I am trying to help a friend choose a wide angle lens for his 77D.  Currently his only lens is an 18-135 zoom.  I am looking at the EF-S 10-18mm f/4.5-5.6, but would rather steer him towards a little faster lens, and it doesn't have to be a zoom.

Am I correct in saying EF lenses are for full frame cameras, but will also work on the 77D?  And as for EF-M lenses, they fit only Canon's mirrorless cameras, right?

If the EF lenses do work, how do I determine the focal length on the 77D?   And are there any downsides to using a full frame lens on a 1.6 crop camera?

Thanks.

Canon EOS 77D / EOS 9000D
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