Originally posted by moomin
P.s I know there's the O-flash but I don't think the lighting is particularly even on it - but i'm open to suggestions if anyone has any good images to show from them
I have an O-flash and the light is distributed well. Both the Ray and the O- have designed a dropout section at the top, but that is necessary to attenuate the most intense light emanating from the flash source. I have been hard pressed to identify any uneven illumination when shooting a wall, for example, as the light from the ring diffuses radially and does not paint a ring on the subject, more of a broad circle.
Kinda off your original topic - i thought the numbers are the measurement(mm) from center of flash head to center of lens, no? That is, you would simply measure and know exactly which model to order.
More on this - these add on attachments add stress to the hotshoe mount of the flash and a tilt to the side can snap the mount right off the flash, so keep it vertical. For this reason, I now prefer to use a flash cable to attach my AF540 and mount it separate from the camera if possible, sometimes will handhold it.