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...I cant understand how to get the 7b to stay lit so I can ajust my aperture/shutter speed accoring to the light
The Profoto 7b is a strobe, not a continuous light. You need to use a flash meter, or take test shots and use the histogram.
...I have to guess then ajust to it after that.
Yep; if you don't have a flash meter, that's how it's done.
...I tried pressing the mldel button but it only stays lit for like 5 seconds than shuts off.
Have you read the User's Manual? There are several modes for the modeling light, giving 20-seconds, 40-seconds, or 60-seconds.
The 7b modeling light doesn't have "always on" like some other packs because this one is battery-based, and the modeling light would quickly drain the battery if left on.
...And does anyone know how to control how powerful the light the speedlight reflects? Dont have a manual.
It takes several button presses, holding some until the proper icon on the LCD starts flashing, etc. Since you're using it off-camera triggered by a PW it needs to be in either Manual power mode or External Autoflash, not ETTL, and since you're using it with another flash source at the same time it should be Manual.
You really need the Instruction Manual, and you can view and save one here:
By the way, if you're more a visual learner and not a reader, Blue Crane Digital has a video lesson on the 580EX II and 430EX II Speedlites, available as either a DVD for $24.99 or a streaming online video for $19.99. You can learn more here:
Edited on Jul 21, 2013 at 06:12 PM · View previous versions