I just bought Camera Axe with Multi Flash Plus to solve different shutter lags on different camera models I have laying around (old Canon 550D, two 600D's, Nikon D3200 and Nikon D7100).
I set all cameras to Manual mode, set all zoom lenses to Manual Focus, made sure all cameras use same settings (ISO 100, F5,6, same WB), disabled any image altering shenanigans (like Active-Dlighting and some such), pointed all cameras at digital stopwatch and triggered them all simultaneously with Camera Axe/Multi Flash. I used no stobe lights to keep things simpler.
What I expected was evidence of consistent (down to 1-3ms) shutter lag, letting me adjust trigger times on Multi-Flash Plus unit, to achieve near-perfect sync.
To my surprise, I only observed consistent shutter lag on Nikon D7100 and Canon 550D. The two 600Ds would either sync perfectly with 550D or be quicker by 43ms, while Nikon D3200 would either sync perfectly with 550D or be slower, curiously by the same 43ms value.
All camera settings look the same, but perhaps there is something I'm missing, something that causes D3200 and 600Ds to sometimes pause and think before taking photos? Any ideas?
Cheers,
Andrew