Canon EF 300mm f/2.8L IS II USM. Canon EF 200-400mm f/4L IS USM EXTENDER 1.4X. Canon EF 400mm f/2.8L IS II USM. Canon EF 500mm f/4L IS II USM. Canon EF 600mm f/4L IS II USM. Canon EF 800mm f/5.6L IS USM.
eBay
SuteFoto EF-EOS R for Canon R50 EF EF-S Lens to Canon EOS R RF Mount Full Frame Cameras Focus Camera Lens Adapter Ring IS Image
Aliexpress UK
For Canon RF 600mm F11 IS STM & RF 800mm F11 IS STM. Canon RF 600mm F11 IS STM. Canon RF 800mm F11 IS STM. The lens collar stand foot bottom is added 45mm long Arca fit quick release plate feature, can be used with 39mm Arca-swiss fit tripod ball head, panoramic head and clamp directly; more practical than lens collars without QR-Plate; also reserved 1/4" and 3/8" screw holes and stainless-steel anti-slip screw for fixing lens to tripod directly;.
eBay
PK-EOS M For Pentax PK Lens - Canon EOS M Mount Adapter Ring K-EOS M EF-M EFM for Canon M5 M6 M62 M6II M100 M200
Aliexpress UK
For Canon EF 100-400mm f/4.5-5.6L IS II USM. The lens collar support foot is tailor-made for Canon EF 100-400mm f/4.5-5.6L IS II USM, can't be used for other lenses. The tripod collar stand bottom is added Arca fit quick release plate feature, can be used with 39mm Arca-swiss fit tripod ball head, panoramic head and clamp directly; more practical than lens collars without QR-Plate.
eBay
M42-EOS M Mount Adapter Ring for Canon EOS M series DSLR Cameras M42 Lens to Canon EF-M Mirroless Camera
Aliexpress UK
This lens holder bottom Quick Release Plate is 39mm Arca-Swiss fit, compatible with RRS / ARCA-SWISS / PMG / WIMBERLEY / MARKINS / PHOTOCLAM / SUNWAYFOTO / BENRO / SIRUI / MARSACE / ISHOOT ball head of Arca 39mm fit, suitable for iShoot IS-JZ30 / IS-JZ50 / IS-JZ64 / IS-QJ58 / IS-QJ64-FD / IS-JZ60BK / IS-JZ70MFT / IS-JZ80BK.
eBay
1.7m Extendable live Tripod Selfie Stick Support LED Ring Dual light mirror Stand 4 in 1 Phone Mount for iPhone X 8 11 Android
Aliexpress UK
CANON Genuine OEM Tripod Mount Ring C (W) for EF 70-300mm f/4-5.6L is USM Genuine product used minor marks clean tidy Grey Provide support for your lens when shooting with a tripod, with this tripod mount ring and adapter. This mount ensures your camera and lens are stable and secure with excellent operability. Easy assembly allows for effortless rotation between both landscape and portrait modes.
eBay
1-5PCS M42 Screw Lens Adapter Universal Lens Mount Adapter Camera Mount Adapter Rings for Canon EOS EF EF-S Camera
Aliexpress UK
The tripod collar bottom is added 70mm long Arca fit quick release plate feature, can be used with 39mm Arca-swiss fit tripod ball head, panoramic head and clamp directly; more practical than lens collars without QR-Plate; also reserved 1/4" and 3/8" screw holes and stainless-steel anti-slip screws for fixing lens to tripod directly;.
eBay
T2 T Mount Lens Adapter Ring For Canon Nikon Sony E Mount Pentax Olympus DSLR 420-800mm/650-1300mm/500mm/900mm mirrorless lens
Aliexpress UK
The tripod mount ring is tailor-made for Canon EF 100mm f/2.8L Macro IS USM Lens; Can't be used with Canon EF 100mm f/2.8 USM Macro Lens. Adopt original factory standard, split structure. It is redesigned and produced by use new material and technology based the old version tripod ring TMR;.
eBay
EOS-C Adapter ring for canon ef eos mount lens to C Mount 16mm CCTV Film cinema cine camera
Aliexpress UK
Canon EF 400mm f/2.8L IS II USM. Canon EF 300mm f/2.8L IS II USM. Canon EF 200-400mm f/4L IS USM EXTENDER 1.4X. Canon EF 500mm f/4L IS II USM. Canon EF 600mm f/4L IS II USM. Canon EF 800mm f/5.6L IS USM.
eBay
Adapter Mount Ring Mount for Canon FD Lens for Sony NEX E NEX-3 NEX-5 NEX-VG10 Camera
Aliexpress UK