The usual problem when shooting with a long telephoto lens using a flash either for fill-in light or to freeze motion, is a darker spot or shadow at the lower part of the photo caused by the telephoto lens itself interfering to the light beam emitted by the flash.
Here comes the need of moving the flash unit forward using a flash bracket.
Longer telephoto lenses have collars, then a flash bracket attached on the collar foot assists further by keeping the center of gravity close to the tripod's pivoting axis removing the flash from the camera top, thus maintaining the camera/lens balance.
More to that, when the camera is turned in the portrait position within the lens collar, the flash will remain always on top.
The idea of creating a Telephoto Flash Bracket was based on the
Boling C-shaped Flash Bracket which I have reviewed earlier.