A while ago I did some comparisons and measurements of Elinchrom inserts showing the flange, the transition from flange to collar, and the bayonet mount.
This comparison is strictly visual and shows how some of the more common inserts place the flash tube.
The Photek and SP Systems inserts are identical and bury the entire flash tube inside the collar. It's completely recessed. The Norman lets some of the flash tube peek out a bit, followed by the Photoflex that places the flash tube in an almost identical position but the flange is slightly thinner, thus revealing more of the tube. Lastly, the Chimera pushes the flash tube the farthest forward.
I still haven't tested or seen proof that the subtle changes make a difference and I suspect that if there is a difference it's probably measurable in some way but not visibly noticeable in the light or in images. I actually find it hard to believe that there could be a visual difference between the Photoflex and the Chimera but I do like the idea of getting the flash tube as far forward as possible. It's not scientific, just a gut feeling.
The Chimera insert not only places the flash tube further forward but also has the largest flange, making it easy to adapt to beauty dishes or other modifiers.
If it weren't for the fact that the Photoflex is a sloppy fit on the Elinchrom bayonet mount, it would be perfect for most applications. I just can't stand the loose teetering fit. The Chimera has a more solid and snug fit.
EDIT: I just added an image of the Elinchrom speed ring. The insert isn't removable so it's impossible to compare to the others.
![]() | HTTP response: NOT FOUND | MIME changed to 'image/gif' | Redirected to error image by FLICKR |


). I didn't feel like disassembling one of my Octa's to get the speed ring. I wish there was a removable insert.

