https://nikonrumors.com/2018/04/12/nikon-patents-a-zoom-eyepiece-fo...
Nikon patents a zoom eyepiece for EVF
Nikon has a new patent (2018-60041) for a zoom eyepiece for EVF. The full title is "Eyepiece Optical system, optical instrument and manufacturing method of eyepiece optical system". Here is one set of specifications described in the patent:
Focal length: 19.632 - 28.835 mm
Object height: 6.350 - 6.350 mm
Total length: 42.823 - 42.823 mm
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https://photo.popco.net/58191