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I've successfully used my pop up on manual mode at 1/128 to trigger old incompatible speed lights in slave mode so essentially it's the sameUser manual for the Bowens Gemini 500Pro Monolight BW-3925USP ; Flash Variability, 5.0 stops with 1/10 stop accuracy ; Color Temperature, 5,600K +/- 300K. View online (12 pages) or download PDF (546 KB) Bowens Gemini Classic GM500C, GM500C camera flashes PDF manual download and more Bowens online manuals.