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Very nice pictures--thanks. Were you using the Ike strobes on sTTL in the aperture or shutter priority, or setting them manually? I'm taking the same rig (with a different strobe) to Cozumel in 2 weeks.
I shoot all Canon cameras using TTL which puts out "pre-flashes" usually in milliseconds to help a camera focus and determine exposure. Modes usable on the Canon S90, G10, G11 (which can be hard wired to an Ikelite Digital Substrobe) are P, Tv and Av.
The Canon S90 without a hots shoe does practically the same when paired with the AUTO sensor of Ikelite's AF35 strobe. It will read the "Start" and Stop" (or quench) of the S90's flash output and mimc it to get as close to a proper exposure.
For the UW shots posted I used Av mode where I adjusted aperture. I DID go in and dial in like - 1 2/3 EV to the OVERALL exposure which makes for a bit bluer richer background water color before switching the Canon S90's Control RIng function to Aperture.
One thing I 've made notes for my next Canon S90 UW shoot is try Tv mode and boost the shutter speed to maybe 1/125. When shooting in Av mode the shutter speed was "locked" at the bottom of the automatic flash selection, 1/60th. Sometimes despite the flash freezing a critter's motion the background was blurred a bit.
I of course tell people this was my "artsy" interpretation LOL......
The Ikelite AF35 Sensor has a dial from 1-10. 10 is highest TTL flash output and 1 the lowest. I set the strobe rear control KNOB on "AUTO" and then fine tune TTL flash with the side flash output knob plus aperture.
I always set a fixed ISO, most of these likely ISO 80 -100 since it was bright light conditions.....
Overall the little Canon S90 was a blast to shoot with above and below. I'm sure I could have done the same with a Canon G11 and may still add one of those to my arsenal
I'm currently using, and liking, my G9 setup (Ike housing, Ike strobes and TTL and INON wet lenses).
It sounds like I would need to give up TTL if I went to the S90 and wanted to use my DS125 & DS51. I find TTL liberating as it allows me to concentrate on composition and lighting, rather than exposure.
A few questions
Did any of your pix use a wide open aperture?
With decent strobes is a fast lens much of an advantage?
At ISO80, is there much of a difference? The G9 is definitely week at high ISO speeds.