Nikon has made a slight correction to its NIKKOR Z Lens Roadmap (July 21, 2020), changing the Micro 60mm lens to a Micro 50mm lens.
Everything else remains the same.
via Nikon Rumors
Nikon Makes a Correction to its NIKKOR Z Lens Roadmap (July 21, 2020), Changes Micro 60mm to Micro 50mm
