bazooka
No longer a newbie, moving up!
- Joined
- Dec 28, 2009
- Messages
- 2,293
- Reaction score
- 294
- Location
- Houston
- Website
- www.dirtjournal.com
- Can others edit my Photos
- Photos OK to edit
So far I've only used Manual lights but I've got a project coming up that requires me to do 175 somewhat environmental portraits, each in a different location, and they need to be taken fairly quickly. I figured it would be worth it for me to buy another E-TTL flash so I can have the key off-camera. So I have my 40D, a 550EX, and a 580EXII.
First question is this... if I put either flash on the hotshoe, set it as master, and turn off the "flash" setting so it should only send a flash signal to the slave (the slave flash is turned off to simplify the experiment) before the shutter opens.... the flash is still partially exposing my picture. At f/4 ISO 200 in a dark room, it's powerful enough to properly expose a subject two feet away. Where is this light coming from?? Is something wrong with my camera that would allow the preflash to be seen by the sensor?
Second question... how do I separately control the power of the hotshoe master and any one group? (Yes, I read the manual. I found it to be poorly written and didn't explain much.) Do I use the FE on the master to control the master? If so, how do I control the FE on any given group?
Third question... when I have the 580EXII on the hotshoe as master and the 550EX as slave, a lot of times the 550EX will only fire the preflash (I can see it out of the corner of my eye) but the photo shows that it did not flash during the exposure, but occasionally it will fire at full power, completely blowing out the subject. When I use the 550EX as master, the 580EXII as slave seems to meter and exposure correctly everytime. What are the possible reasons for this? Is it possible the 550EX is faulty?
Thanks!
First question is this... if I put either flash on the hotshoe, set it as master, and turn off the "flash" setting so it should only send a flash signal to the slave (the slave flash is turned off to simplify the experiment) before the shutter opens.... the flash is still partially exposing my picture. At f/4 ISO 200 in a dark room, it's powerful enough to properly expose a subject two feet away. Where is this light coming from?? Is something wrong with my camera that would allow the preflash to be seen by the sensor?
Second question... how do I separately control the power of the hotshoe master and any one group? (Yes, I read the manual. I found it to be poorly written and didn't explain much.) Do I use the FE on the master to control the master? If so, how do I control the FE on any given group?
Third question... when I have the 580EXII on the hotshoe as master and the 550EX as slave, a lot of times the 550EX will only fire the preflash (I can see it out of the corner of my eye) but the photo shows that it did not flash during the exposure, but occasionally it will fire at full power, completely blowing out the subject. When I use the 550EX as master, the 580EXII as slave seems to meter and exposure correctly everytime. What are the possible reasons for this? Is it possible the 550EX is faulty?
Thanks!