Thanks. Figures it's faster.All images were taken during the day - but ambient light was dim due to overcast skies and a thick green layer of water above the bottom. Essentially, all light was from the strobes.
The 60mm is much faster to focus with the OM-1. I set the focal limit on the lens (0.19-4.0m).
I think you had another post about the EM1 but are you using the Nauticam housing and are all the mounts the same as the EM5? Therefore no new ports, adapters, etc?