Zeiss Plan-Apochromat 20x 0.75
From BioDIP
https://www.micro-shop.zeiss.com/?l=en&p=us&f=o&a=v&m=t&id=440649-0000-000&o=&st=1 Objective Specifications]
https://www.micro-shop.zeiss.com/?l=en&p=us&f=o&a=v&m=t&id=440649-0000-000&o=&st=1 Objective Specifications]