The Finnish Caving Association was having a course on basic caving. I've been on that course... but it seemed like a fun thing to do and a nice visit to Turku. And I ended up doing more practice with cave photography using multiple flashes and radio triggers.
My previous attempt was not entirely successful, the back light not being very visible. I think I got the idea now, having increased the flash level on the back flash -- even on a small area and with just half a meter distance, I used 1/4 or 1/2 flash output on a Nikon SB-910, and the front/side flash was set at 1/8 on a Nikon SB-25. For bigger spaces I may actually need more powerful equipment.
The Nikon flashes that I have are around GN 30, whereas the flash we used in the bigger caves in Austria had a GN of over 100.
Looking forward to trying this technique out even further. But it is not easy, the technology is just a tiny part of the issue. Figuring out what makes artistic sense, where is a suitable place to take a reasonable photo, coordinating everything so that there's someone who is exactly at the right place, has the right expression that supports the photo setup, and so on is hard!
I was also inspired by two other things on this trip, first off, fed up with garbage on the cave sites, I decided to bring all that I could find back to a trash can and do it on all my future caving trips as well. And secondly, we got to witness Dare Talvitie's new book's (Valkea Liekki) release event. Looking forward to reading it!
Here is Ralf and Jukka holding lectures: