Hejnar Photo quick-release system is based on the Arca-Swiss
standard and use two parts: clamp and a
plate rail lens foot etc. You always have to use both pieces of the system. The
clamp will stay mounted to tripod head/accessory, and the plate will stay mounted
on your camera / lens or other component. You will need a separate
quick-release plate for each camera or collared, telephoto lens that you want
to mount in the clamp on your tripod head.
Clamp jaws open and close by twisting a knob on clamps.
Traditional screw-knob clamps deliver greater clamping force than competitors lever
clamps. Screw knot clamps also in moist cases will accept plates
from various manufacture in slightly different sizes so your selection of accessories
is not limited to one manufacture.