Zenitar 16mm with Nikon adapter or direct nikon mount?

[behyx]

As above,

if you don't understand the subject, i meant:

case 1: Zenitar Lens (m42 mount) + nikon adapter
or
case 2: Zenitar Lens (direct nikon)

I know both cannot do auto focus, but what are the differences between the 2 cases? Can case 1 do metering?

 

[behyx]

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