This is from Tokina (Google translated from Japanese):
300mm: focal length (equivalent to version 35mm: equivalent to 600mm)
(Fixed for reflex type) F6.3: brightness
66mm: length lens
66mm: the maximum diameter
55mm: diameter filter
Less than 300g: Weight
Remarks: Equipped with distance encoder, can communicate with the body. (Exif, lens information, etc.)
Minimum focusing distance 0.8m. Macro of 1:2 can be taken.
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I have the OM Zuiko 500mm f/8, so shouldn't be interested. Still, this one is smaller, lighter and has a larger aperture in addition to communicating with the body. For my OM-D?