I just got some RP P1 to play around with and was wondering what is the benefit of having a 580 on the camera hot shoe as opposed to a ST-E2 transmitter. What can I do with the 580 that I can't do with the ST-E2?
I currently have a 580EX I, and a 430EX I, and was wondering what to add a second 580EX I or II or a ST-E2 to take advantage of both flashes off camera. I hate to use a 580EX just as a master and never have it fire.
esanchez wrote:
...so FEC on camera is different from dialing in power from the flash? ...Can I control the off camera flash let's say the 430EX as well with the ST-E2 [as] I can with a 580EX.... Power wise??
The difference is that the ST-E2 is ETTL only; no manual control.
While you can vary the power by using FEC, it is still measuring the subject reflectance first, assigning an output level, and then modifying that level by the + or - FEC amount. If a person steps into the frame wearing a black shirt, the flash output can be different than if he or she is wearing a white shirt.
If you're using a 580EX as Master, you can set an actual power level -- from Full power to 1/128th power (1/64th on the 430EX) -- and it will be fixed at that level regardless of subject reflectance.
BrianO wrote:
The difference is that the ST-E2 is ETTL only; no manual control.
While you can vary the power by using FEC, it is still measuring the subject reflectance first, assigning an output level, and then modifying that level by the + or - FEC amount. If a person steps into the frame wearing a black shirt, the flash output can be different than if he or she is wearing a white shirt.
If you're using a 580EX as Master, you can set an actual power level -- from Full power to 1/128th power (1/64th on the 430EX) -- and it will be fixed at that level regardless of subject reflectance....Show more →
BrianO,
I'm a little confused. Are you saying you can control a 430EX in manual from your 580EX on camera (power settings)? You could change the 430EX from half power to full using the 580EX on the camera?
