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You're right Paul, the strobe is firing at around 1/1500 sec so it doesn't affect the exposure as the ambient is totally overpowered by the flash (even at it's lowest setting). I've just tried it at 1/250 and 1/320 on my D300 and the f stop remains constant. I want to shoot some portraits close up focussing on the eyes but can't open the apeture wide enough I need at least f2.8 but can't get nowhere near it with this set up.Guess I'll have to keep trying and find some gels as suggested.
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