Question about a Distagon T 2/28 mm ZF

ZE = direct mount, no adapter necessary, but also - no aperture ring.
ZF = Nikon mount, you'd need an adapter, but it also has an aperture ring.

If you're only ever going to use it on a Canon body, the ZE is the better choice. If you may move to Nikon or other cameras in the future, you might want to consider that aperture ring, and that Nikon mount is more adaptable to other camera bodies than Canon mount.
 
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