Here are the full VF-4 external viewfinder specs. Interesting that the Eye Sensor will work for the E-P5 and the “Japanese” A-PL6 only:
Finder Type approx. 2.36M-dot approx. 1.44M-dot approx. 920k-dot
Viewfinder magnification / Field of view Approx. 1.48x (-1m-1, 50mm lens, Infinity) / Approx. 100% Approx. 1.15x (-1m-1, 50mm lens, Infinity) / Approx. 100% Approx. 1.0x (-1m-1, 50mm lens, Infinity) / Approx. 100%
Eye point Approx. 21mm (-1m-1, Distance from rear lens surface) Approx. 18mm (-1m-1, Distance from rear lens surface) Approx. 17.4mm (-1m-1, Distance from rear lens surface)
Diopter adjustment range -4 ~ +2m-1 -3 ~ +1m-1 -3 ~ +1m-1
Eye Sensor Available* *E-P5, E-PL6 - -
Lock mechanism Available
Weight 41.8g 32g 28g
Dimension 30.4ｍｍ（W）× 48.2ｍｍ（H）×47.8.ｍｍ（D) 29.4ｍｍ（W）× 48.5ｍｍ（H）×46.3.ｍｍ（D) 25.4ｍｍ（W）× 44.1ｍｍ（H）×43.8.ｍｍ（D)
Optional Eyecup - EP-9 is available. -
Compatible Body ”E-P5 / E-PL6* (Compatible with eye sensor ) *When using E-PL6 and VF-4, eye sensor function is same as E-M5
E-PL5, E-PM2, E-M5, E-PL3, E-PM1, E-P3 Firmware update required, Not compatible with eye sensor）
E-PL2, E-PL1, E-PL1s, E-P2, XZ-2 （Firmware update required, Not compatible with eye sensor, Image degradation on view finder.）”
Reminder: The Olympus E-P5 and the three black primes will be announced on May 10 at 6am London time. 43rumors will follow the event with live updated!
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FT1=1-20% chance the rumor is correct
FT2=21-40% chance the rumor is correct
FT3=41-60% chance the rumor is correct
FT4=61-80% chance the rumor is correct
FT5=81-99% chance the rumor is correct