The Arca-Swiss Svilt Quick Release Adapter is an "L" shaped quick release plate that fits into any Arca Swiss-type quick release system, and provides a Flip-Lock adapter at 90° to the head's quick release.
The advantage of this plate is to allow the use of the ballhead in the 90° vertical orientation position, limiting the ball movement to tilt operation only. This greatly simplifies the control of long, heavy telephoto lenses and is heartily recommended.
Note! Requires camera mounting plate.
Svilt "L" Quick Release Adapter with Flip-Lock (Requires Plate) - 60mm Long Base