Several oculars can be used for the incident/transmitted light stereo microscope (ES3320). The following values are obtained with the different available oculars:
 

Magnification	10x	20x	30x	60x	40x	80x
Visual field	10.5 mm	5.5 mm	7 mm	3.5 mm	4.5 mm	2.5 mm
Working distance	75 mm	45 mm	64 mm	43 mm	64 mm	43 mm
Ocular	5x	5x	15x	15x	20x	20x
Objective	2x	4x	2x	4x	2x	4x

Several oculars can be used for the incident light stereo microscopes (ES3313 and ES33263). The following values are obtained with the different available oculars:
 

Magnification	5x	10x	15x	30x	20x	40x
Visual field	20 mm	10 mm	12.4 mm	6.2 mm	9.6 mm	4.8 mm
Working distance	79 mm	84 mm	83 mm	83mm	83 mm	82 mm
Ocular	5x	5x	15x	15x	20x	20x
Objective	1x	2x	1x	2x	1x	2x

Manufacturer No. 334081 (5x), 334082 (15x), 334083 (20x)