The tripod mount ring mount on the tripod, it helps you fix and balance your tele lens which is heavy or long lens hanging off the front of camera.
100% fits Tamron and does have same construction.
RING: Advanced CNC processing,High quality Anodized aluminum alloy
RING SPECIFICATIONS:
Ring inner diameter: 72.8mm
Ring width: 18mm
Ring thickness: 4.5 mm
Color: Black
The UNC (Unified National Coarse Thread) is 1/4" and 3/8"
Suitable For:
Tamron SP 70-200MM F/2.8 DI VC USD (A009)
Item Included:
Lens Tripod Mount Ring x 1