>Does the Graslon Prodigy interfere at all with the sensors on >the front of you speedlight when using TTL or AA mode? > >Do you dial in any flash compensation when using it?
Currently I use the Prodigy on my SB-800. I haven't tried AA mode with it, but the AA sensor is well below the bottom edge of the Prodigy so it is not blocked. Also (at least with the flat panel model) it does not look as though light from the panel would shine into the sensor and cause exposure problems. The red focus assist function definitely works with the Prodigy mounted.
So far I have only used it in TTL and TTL-BL modes and have not seen the need for any flash compensation.