Paul C. Buff, Inc. Technical Forum

Have used these units for years with white umbrellas.
Useing two WL's set to 1/3 power approx 6-10 feet from subject and set a 45 degree angles to subject. This has been my base setup. Tethered flash cord from Canon 40D to one WL.

Attached new Silver Umbrella and that unit does not synch flash.
Removed the Silver and replaced it with old white umbrella and it works?

Explaination please. :?

White shoot through or white bounce? It is likely a slave eye issue where the white translucent material will pass light through to the slave eye, where the silver is opaque and block it. Most of the 10,000K's had slave eyes in the front, but a few near the end of the production cycle had them in the rear. It is possible that this could occur regardless if the silver umbrella was on slave (directly blocking the slave eye) or on the master (directing the light in a tighter beam, which may not spread to the slave eye of the other light). Switching which light you run a cord to, or moving one of the lights forward or back may solve the problem, which is inherent to the line of sight optical triggering method.

Thank You for the response:
A: White Bounce.
And don't believe it was an issue of shoot thru blocking the eye. I made two changes, one moved the flash cord to the other unit, no change, and changed out silver to white.

See if turning the model lamp off would change anything. It could be the silver is reflecting too much light and saturating the slave eye.

Hi, Haven't had a chance to get back out to try your suggestion, as had to do some temp storage in that area which will be moving out this weekend, hoorah. But I replaced the flash lamp in one of the units, does that have any effect as to the issue we are discussing???

Thanks and Best regards,
Douglas

A flash tube would not affect the ability to slave. It would either work or not work.