Will this adapter be compatible with my 100-400ef mk11 on my r8

I have used it with 2 canon ef lenses works great but with my tamron and sigma it leaves a vignette so I would say it will work fine with your 100-400.

Is this the adapter that comes with the canon r and rp cameras when bought anew?

It depends which one (on this multi-option listing) you and/or the Question responder are looking at. "Adapter" - sometimes but not always - bundled with the EOS R and EOS RP. "Adapter with lens control ring" - never seen this as part of a ready-made bundle. Seems to be popular for the extra functionality. The other two allow you to use drop-in filters. Again, never seen either as a ready-made bundle with the R or RP. Harry Potter and the curse of the multi-option listing.

Will this work with lenses from my Canon 7D please ?

The Canon 7D uses EF lenses, so any lens you have for the 7D can be mounted to RF moj t with this adapter

Is this adapter weather sealed?

According to Canon, yes they are. Also dust sealed when connected. The Canon version us beautifully flat and forms a perfect seal. I have 3 R adapters for use with EF lenses on the R . I believe they also fit the smaller RP too.

Canon 2971c005 Bayonet Adapter Ef Eos R Black

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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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Description

🔗 Unlock your lens legacy with Canon’s pro-grade adapter!

RUGGED RELIABILITY - Dust and splash resistant build keeps your gear protected in any environment.
COMPLETE KIT INCLUDED - Comes with camera housing cover, lens back cover, case, and manual—ready for action.
UNIVERSAL LENS FREEDOM - Use your entire EF and EF-S lens collection effortlessly on EOS R bodies.
PRO GRADE COMPATIBILITY - Works flawlessly with EOS R3, R5, R6, R, and RP models for ultimate versatility.
FEATHERLIGHT FLEXIBILITY - At just 110 grams, it won’t weigh down your professional setup.

The Canon 2971C005 Bayonet Adapter EF-EOS R is a precision-engineered mount adapter that enables seamless use of Canon EF and EF-S lenses on EOS R mirrorless cameras. Designed for professionals, it offers dust and splash resistance, lightweight portability at 110 grams, and broad compatibility with EOS R series models including R3, R5, R6, R, and RP. The package includes essential protective covers and a carrying case, ensuring your investment is safeguarded while expanding your creative possibilities.

Specifications

ASIN	B07H5SL6W3
Best Sellers Rank	4 in Lens Flash Adapters & Converters
Box Contents	1
Brand	Canon
Brand Name	Canon
Camera Lens	The Canon EF-EOS R bayonet adapter allows the use of EF and EF-S lenses on EOS R cameras. It fits any camera with RF bayonet and is dust and splash proof. EF-S lenses can also be connected, with the camera then generating a picture section. The adapter is compatible with the EOS R3, EOS R5, EOS R6, EOS R and EOS RP.
Camera lens description	The Canon EF-EOS R bayonet adapter allows the use of EF and EF-S lenses on EOS R cameras. It fits any camera with RF bayonet and is dust and splash proof. EF-S lenses can also be connected, with the camera then generating a picture section. The adapter is compatible with the EOS R3, EOS R5, EOS R6, EOS R and EOS RP. Camera lens description The Canon EF-EOS R bayonet adapter allows the use of EF and EF-S lenses on EOS R cameras. It fits any camera with RF bayonet and is dust and splash proof. EF-S lenses can also be connected, with the camera then generating a picture section. The adapter is compatible with the EOS R3, EOS R5, EOS R6, EOS R and EOS RP. See more
Colour	black
Compatible Camera Models	Canon EOS R, Canon EOS R5, Canon EOS R6
Compatible Devices	Canon EOS R Kameras
Compatible Mountings	Canon EF
Compatible mountings	Canon EF
Country of Origin	Taiwan
Customer Reviews	4.6 out of 5 stars 2,582 Reviews
Exposure Control Type	Automatic
File Format	MP4
Focal length description	Adapter, pas de longueur focale
Focus Type	Manual Focus
Global Trade Identification Number	04549292115703
Has Self-Timer	Yes
Image Stabilization Type	no image stabilization
Iso Range	100-40000
Item Type Name	Bayonet adapter for EOS R
Item Weight	110 Grams
Lens Color	black
Lens Design	Prime
Lens Mount	Canon EF, Canon EF-S
Lens Type	Mount Adapter
Lens design	Prime
Lens type	Mount Adapter
Light Sensitivity	100-40000
Manufacturer	Canon
Manufacturer Part Number	EF-EOSR
Media Type	ProductImage
Model Name	Canon EF - EOS R
Model Number	2971C005
Number of Items	1
Number of Packs	1
Screen Size	1.5 Inches
Shooting Modes	Automatic, Unknown specific modes
Video Capture Format	MP4
Viewfinder Type	Electronic viewfinder (EVF)
Water Resistance Level	Water Resistant
Zoom Ratio	1

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