I own all 3 of the lenses listed above. The Samyang 7.5mm FE was the first really wide m43 lens I bought, followed a few years later with the Olympus 7-14mm f2.8 Pro. I recently had an opportunity to buy an 'open box' Olympus 8mm f1.8 at a discount; the fast aperture and autofocus/auto aperture were added incentives.
I now own 3 wide angle lenses and figured it was prudent to see what the AoV differences were before potentially selling off the Samyang. I mounted my E-M1 II on a tripod and changed lenses and 8mm FE corrections (none, -1, -2, -3) to also compare the 8mm corrected performance against the wide Pro zoom.
Here's the result:
The Samyang 7.5mm FE is wider than the Olympus 8MM FE.
Olympus 7-14mm results in the next post in this thread.
I now own 3 wide angle lenses and figured it was prudent to see what the AoV differences were before potentially selling off the Samyang. I mounted my E-M1 II on a tripod and changed lenses and 8mm FE corrections (none, -1, -2, -3) to also compare the 8mm corrected performance against the wide Pro zoom.
Here's the result:
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The Samyang 7.5mm FE is wider than the Olympus 8MM FE.
Olympus 7-14mm results in the next post in this thread.