What, exactly, is the difference between the $99 vers and the $199 vers?

the one with ring allows you to assign another function to the ring. e.g. exposure compensation. Giving you extra flexibility.

Does this adapter affect autofocus of the R series cameras under challenging conditions--like a bird in flight against busy background?

The adapter has no glass, its main function is to set the proper distance between the sensor and the EF lens.

will this adapter work with sigma 18-35mm f1.8 art dc hsm lens for canon and will work with sigma 30mm f1.4 contemporary dc dn lens for sony e ?

This adapter should work with the sigma 18-35mm for Canon EF mount but the image won't cover all of a full-frame sensor because DC lenses are made for smaller APS-C sized sensors. You can enable crop mode in your EOS R camera to only use part of the sensor. No, this adapter is not for Sony mount lenses.

Add doesn't mention rf...it just says r-type which is confusing. that's not the standard term. so this product allows me to attach ef to my r5?

Yes this lets you mount EF lenses to R Series Cameras like the R5.

Canon Mount Adapter Ef Eos R Connect Ef Lens To

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

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Description

🔗 Unlock your EF lens legacy with EOS R power — don’t get left behind!

COMPACT LIGHTWEIGHT - At just 0.24 pounds, this adapter adds minimal bulk while maximizing creative possibilities.
FUTURE PROOF YOUR KIT - Keep your investment alive and thriving as you upgrade to Canon’s latest EOS R cameras.
BUILT FOR ALL CONDITIONS - Weather-sealed design ensures your gear stays protected on every shoot, rain or shine.
EFFORTLESS LENS TRANSITION - Connect your trusted EF lenses to the cutting-edge EOS R system without missing a beat.
DSLR PERFORMANCE MIRRORLESS FREEDOM - Experience the same fast, reliable autofocus you love from your DSLR in a sleek mirrorless body.

The Canon Mount Adapter EF-EOS R bridges your existing EF and EF-S lenses to Canon’s EOS R mirrorless cameras, preserving full autofocus functionality and performance. Its weather-sealed construction protects against dust and moisture, making it ideal for professional use in diverse environments. Lightweight and compact, it ensures seamless integration of your DSLR glass with the latest mirrorless technology.

Specifications

ASIN	B07H4CR6Y9
Age Range Description	Adult
Aperture modes	f/22
Are Batteries Included?	No
Aspect Ratio	3:2
Aspect ratio	3:2
Auto Focus Technology	Hybrid
Autofocus	Yes
Autofocus Points	45
Available Memory Slots	1
Best Sellers Rank	48,674 in Electronics & Photo ( See Top 100 in Electronics & Photo ) 499 in Camera Lenses
Bit Depth	10 Bit
Box Contents	1 Piece
Brand Name	Canon
Camera Flash Type	Built-In
Camera Lens	105 mm
Colour	Black
Compatible Devices	Canon EOS 5D Mark IV DSLR Camera (body only, black), which has a Canon EF mount
Compatible Flash Memory Type	SD
Compatible Mountings	Canon EF, Canon EF-S
Compatible mountings	Canon EF, Canon EF-S
Continuous Shooting Speed	60 FPS
Crop Mode	3:2
Customer Reviews	4.8 out of 5 stars 2,661 Reviews
Digital Scene Transition	false
Digital-Still	Yes
Display Fixture Type	Fixed
Display Maximum Resolution	3840 x 2160
Display Type	LCD
Dots Per Screen	[~300000]
Effective Still Resolution	30.3 MP
Expanded ISO Minimum	100
Exposure Control	Program (P) mode
File Format	RAW
Flash Memory Bus Interface Type	SD
Flash Memory Speed Class	10
Flash Memory Type	SD
Flash Modes Description	Various flash modes supported
Flash Sync Speed	1/200
Focus Features	Phase Detection Autofocus
Focus Mode	Automatic AF (AF-A)
Focus Type	Auto Focus
Form Factor	Mirrorless
Generation	1
Global Trade Identification Number	00013803304886
Has Color Screen	Yes
Image Capture Type	Stills & Video
Image Stabilization Type	Digital
Image stabilisation	Digital
Item Type Name	Canon US EF-EOS R Camera Mounting Adapter Black Normal Size (2971C002)
Item Weight	0.24 Pounds
JPEG Quality Level	Normal
Lens Construction	Single Prime
Lens Correction Type	Chromatic Aberration
Lens Type	2000 millimeters
Manufacturer	Canon
Manufacturer Part Number	2971C002
Maximum Aperture	20 Millimetres
Maximum Display Resolution	30.3 MP
Maximum Focal Length	105 Millimeters
Maximum Shutter Speed	1 seconds
Maximum focal length	105 Millimeters
Metering Methods	Centre-weighted
Minimum Focal Length	20 Millimeters
Minimum Shutter Speed	1 Seconds
Model Name	Mount Adapter EF-EOS R
Model Number	2971C002
Model Series	EF-EOS R
Movie Mode	Yes
Network Connectivity Technology	USB
Night vision	No
Number of Diaphragm Blades	7
Number of Items	1
Photo Sensor Size	Full Frame (35mm)
Photo sensor technology	CMOS
Product Features	Canon EF/EF-S Lens for EOS R Camera; Dustproof and Water Resistant
Real Angle Of View	12 Degrees
Rear Webcam Resolution	30.3 MP
Recording Capacity	1 Minutes
Remote Included	No
Screen Size	3.15 Inches
Self Timer	10 Seconds
Sensor Type	CMOS
Shooting Modes	Automatic, likely others including Manual, Shutter Priority, Aperture Priority, Program
Skill Level	Amateur
Specific Uses For Product	versatile photography and videography situations
Supported Image Format	RAW
Supported file format	RAW
Total Still Resolution	30.3 MP
Total USB 3.0 Ports	1
Total USB Ports	1
Total Video Out Ports	1
Touch Screen Type	Capacitive
UPC	013803304886
Video Capture Resolution	1080p
Video Output	USB
Viewfinder Magnification	0.76x
Viewfinder Type	Electronic
White Balance Settings	Auto
Wireless Technology Type	Wi-Fi
Write Speed	High
Zoom	Optical Zoom

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Canon Mount Adapter EF-EOS R - Connect EF Lens to Canon EOS R System Cameras

Details

Details

Description

Specifications

Common Questions