Eyepiece adapter in different magnifications with diameter 23.2 mm or 31.75 mm for mounting the HDMI camera. If a stereo microscope is to be upgraded with an HDMI camera and does not have a third beam path for mounting cameras with C-mount thread (trinocular), one of the eyepieces is pulled out and replaced by the eyepiece adapter. Depending on the diameter of the original eyepiece, an intermediate adapter with 30.0 mm or 30.5 mm must be ordered for the adapter with diameter 23.2 mm. This adapter ring is simply plugged onto the eyepiece adapter. The eyepiece adapters for the HDMI camera with autofocus are not adjustable, as otherwise the mechanics of the autofocus system could be damaged.