This part of ISO 9345 specifies the imaging distances of objectives and eyepieces of microscopes with 160 mm mechanical tube length or equivalent.
NOTE 1 A specific combination of eyepiece and objective is frequently used to correct aberrations. Therefore, the combination of an objective from one manufacturer and an eyepiece from another manufacturer, although conforming to this International Standard, may cause loss of image quality.
ISO 9345-1:1996 history
2012ISO 9345-1:2012 Microscopes - Imaging distances related to mechanical reference planes - Part 1: Tube length 160 mm
1996ISO 9345-1:1996 Optics and optical instruments - Microscopes - Imaging distances related to mechanical reference planes - Part 1: Tube length 160 mm