amsikking: Microscope objectives

Mechanics

For integration purposes the physical size and shape of an objective may be important. Due to the popularity of using different objectives on the same instrument, the major manufacturers tend to standardize the mounting threads and parfocal distance (i.e. the distance from the objective flange to the image plane):

Make	Standard thread	Parfocal distance (mm)
Leica	M25x0.75	45
Mitutoyo	M26x36TPI	95
Nikon	M25x0.75	60
Olympus	W20.32x0.706 (RMS)	45
Zeiss	M27x0.75	45

The major manufacturers now release detailed 2D drawings which can be used to produce 3D CAD models if needed. For example here's a drawing for the Ninon 100x1.35 Silone objective: