W – for immersion
 
 
Carl Zeiss Surgical, Inc.
Physiological applications involving living cells and/or tissues often require water objectives which can be dipped directly into the culture medium. W objectives have a conical tip made from special inert plastic. They are often, but not only used in combination with a fixed-stage microscope. These objectives are distinguished through their outstanding optical performance with good flatness of field and high transmission for perfect results in physiology.