Q: Why must I tilt the flash head to 45 degrees?
A: In Non TTL models this is necessary to avoid under exposure caused by light from the Omni hitting the external auto sensor of the flash. In TTL models it gives a better feathering wrap around of the light in the range from close to about 15 feet (4.5m) from the subject. Beyond that point with TTL we find straight on works OK for you.
Q: What adjustments in exposure do I have to make using the Omni?
A: We have found that with the automation offered in most of today's flashes makes exposure quick and easy. No exposure adjustment is needed on your part. The only thing that happens with the Omni in place is the Maximum Distance of the flash is reduced by a factor of 2.5. For example if your Max Distance is 50 feet divided by 2.5 now equals 20 feet with the Omni in place.