Just for fun, I thought I'd try some pool tests of Retra TTL using a UW Technics board in a Seacam housing.
To be fair, the Retra is not profiled for this board, so I set the board on Setting1, which is the profile for S+S YS-D1, and Inon Z240. This was suggested by Pavel.
Test conditions were:
Pool, very dim ambient light
ISO 100 and 400,
Aperture f2.8 - f32,
Measured distance 0.75 meter,
Nikon D800e with Nikon 105 Macro G lens,
Seacam Silver housing, UW Technics finer optic bulkheads
UW Technics controller Position #1
Rear curtain flash
The point of this exercise is to compare Retra TTL to baseline (YS-D1)
1) Not sure what happened with the first two frames of the Retra ISO 400 test. Didn't spot this in the pool. Maybe too trigger happy?
2) The system works well enough for Retra using these parameters. It should get you in the ball park for macro at ISO 100.
3) ISO 400 is more variable on both strobes. It's all over the place with Retra.
4) It is within the range of what Lightroom can cope with.
5) Best at apertures f8-f22, probably the sweet spot.
6) I would probably add +0.7 eV of compensation
I would use it on a shot where you might not get a second chance...certainly better than my best guess!
I haven't tried Reta TTL on wide angle.
Overall, it's pretty good:)
Maybe Pavel will write a firmware update for this strobe? (Hint, hint)
Edited by ianmarsh, 21 January 2018 - 03:05 PM.