The only Zuiko 35mm f3.5 macro lens is one for the Olympus digital 4/3rds system.

If it is this lens then it won't fit onto an OM system film camera without an adaptor and then it becomes a 70mm f3.5.

The Olympus OM system also included true macro lenses which would only work with a bellows unit and were optimised for macro work.

BTW I have used the Zuiko 50mm f3.5 macro lens at all distances within it's focusing range without cause for concern.

Chris