OK, I'll play
Strobe power is so over rated in today's digital world.....
Even the cheapest P&S (point and shoot) digital camera with only a program mode will open between f2.8 - 4 or on shots in tropical conditions AUTOMATICALLY at ISO 100 - 200.
This means your strobe ain't gotta' be very powerful IF, and that's a HUGE IF people don't try and back up and shoot farther than a real 4' away.
4' strobe to subject distance means your flash will travel through 8' of water after bouncing off your subject before it reachs the camera sensor.
Even that's too far away IMHO. People should get close, add a wide angle if they want more in their frame and shoot more pics......
I have taken photos of people on trips (yes, Ikelite customers) who SWEAR they're shooting from 2' away when they're really about 4' or more.....
I sell all three Ikelite strobes.
People buy the DS160 for warmer color temp, faster recycle time (the trade off of bigger, heavier and more expensive) and beam angle coverage.
People buy the DS51 or AF35 for lightweight and automatic features and lower cost.
The DS51 is within a stop or so of the DS160 but has a narrower beam and 5700 K color temp.
The AF35 a bit less power, same coverage and color as the DS51.
Most people have no friggin' idea where their strobe is aimed anyway so they'll use POWER and beam angle as a crutch.......
Not saying it doesn't help folks get good pics. It's just that POWER, Beam angle and whatever else doesn't dictate if a strobe is a toy or decent flash
My point was not to start a brand war, just give the OP some real world advice.
He could tape a piece of white foam in a "V" to bounce the flash from his forthcoming FIX housing flash window.
The AF35 sensor will work AUTOMATICALLY versus all this BS about setting everything manually just because you can on a S90 or S95. I know since I've shot one for a few thousand frames underwater with a Canon S90.
Use Av mode, f4 - 5.6 , TTL flash selected in menu, Solid Lightning Bolt ON. ISO of 100 if bright, maybe 200 if early in day or late afternoon.
Back dial of AF35 on AUTO, side dial start at say 6. Going to 10 is more flash. Dialing down to 1 is less flash.
That's it.......
Please go back and read posts detailing how to fly an INON Z240.......It's like a space shuttle
Not sure if S2000 or other Sea and Seam models are more or less complex......
As I said before, put pics up with color, in focus and the frame filled and then the gear talk can commence with proof
Photos below shot with Tokina 10-17mm Fisheye lens on a digital SLR lit with ONE Ikelite DS51 strobe.
Then again, I know how much 80 degrees of flash covers in a photograph........
YMMV
dhaas
David Haas Underwater Photography