I really don't understand why Olympus built such a heavy lense as the 8 mm fisheye suppose to weight 485 g !!!!
The Tokina 10-17 is 350 g only , the Nikon 10,5 305 g !! Without speaking of the 165 g of the Panasonic 8 mm !!!!!
What a strange world were we try to go as light as possible with the micro 43 and were the only thing that do Olympus is to innovate with probably the most heavy fisheye on the market all groups included .
Normally we all agree to pay a very expensive price for the micro 43 lenses , assuming that this was for the miniaturization , but clearly this advantage is gone .....
Would you kindly notice also that the minimum distance of focus is exactly the same between the Pana and Oly 8mm , that the aperture at 1,8 is not of a major interest underwater .
This lense will have to prove major optical benefices versus the Panasonic to be worth the need of spending 999 $ or € depending of your geographical situation