Hi all, My current setup is Sony A7M4 and Sony 90mm marco (Tarmon 90mm can be borrowed from my friend), since my favorite is macro to super marco then normally I will put the focal range switch on 0.28-0.5m, which can reduce a lots of uncessary focusing move. Now my MFO-3 is on the way, I have already checked the review videos and discussion threads in the forum, but still not so sure what would be the best option for the focal range switch setting. Especially the new Sony 100 marco is also in my wishlist🤣 Let me try to list all the possibilites and please share your experience and suggestions Daylight diving without mfo-3, focal range 0.28-0.5 Daylight diviing with mfo-3, focal range 0.5-infinity or full range? Blackwater diving with mfo-3, focal range 0.5-infinity? Thanks~