Posted by ScubaBob
on 02 September 2014 - 10:44 AM
Not the best first showing, but I was finally able to get my GH4 underwater a couple weeks ago. We went out in search of Giant Sea Bass (aka Black Sea Bass) so I started the day with my 7-14mm. Viz was less than ideal, so I switched to the 12-50mm for the last two dives (all footage shown in chronological order). Lessons learned (which are not new or unique to the GH4) are use of manual focus on the 7-14mm and stability (tripod) with the 12-50mm. Overall I'm very excited about using the GH4 more underwater..
Did some testing with the GH2 and Olympus 12-50mm zoom in E-Zoom mode. The lens doesn't appear change focus at all while zooming, but quickly re-hunts depending on focus mode. I found the best results were using AFC, and giving the zoom a little help with a half-depress when zooming was completed. Manual zoom mode (not available using the nauticam port with the zoom/macro gear) seemed to focus a little bit more while zooming, but it's never really a constant zoom with this mode. These tests were handheld, with fairly low light,@ f6.3, 1/60, ISO 1600.