BNC 1420 - Video Microscope - Manual (Page 16)

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Camera module
Note: When removing or inserting the camera module, take care not
to apply excessive force since this may damage the traverse
mechanism and compromise traverse accuracy.
2.5 Microscope objective
The microscope objective is a standard DIN type objective with 160 mm
conjugate image distance. To replace the objective, remove the camera
module and unscrew the objective. The Model 1420 supports objectives
with magnifications from 4× to 20×. Objectives with higher magnification
generally have insufficient stand-off distance to clear the illuminator
LED s and can only be used with an external illuminator module or other
external light source.