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.

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Description

🔗 Bridge the old and new — never leave your favorite lens behind!

COMPACT LIGHTWEIGHT - At just 0.24 lbs and pocket-friendly dimensions, it’s the perfect travel companion for pros on the move.
BUILT FOR THE ELEMENTS - Weather-sealed design keeps dust and moisture out, so your creativity never stops—indoors or out.
FUTURE PROOF YOUR GEAR - Keep shooting with confidence as Canon continues to support your adapter with reliable software updates.
EFFORTLESS LENS COMPATIBILITY - Use your trusted EF lenses on the cutting-edge EOS R system without missing a beat.
DSLR PERFORMANCE MIRRORLESS FREEDOM - Experience the same autofocus speed and image stabilization you love, now in a sleek adapter.

The Canon Mount Adapter EF-EOS R lets professional photographers seamlessly connect EF lenses to the latest EOS R mirrorless cameras. Engineered to preserve DSLR-level autofocus, image stabilization, and performance, this weather-sealed adapter ensures durability in challenging environments. Compact and lightweight, it’s an essential tool for creatives who demand flexibility and reliability while future-proofing their lens investments.

Specifications

Package Dimensions L x W x H	12.7 x 11.9 x 8.1 centimetres
Package Weight	0.25 Kilograms
Product Dimensions L x W x H	7.1 x 7.1 x 2.3 centimetres
Item Weight	0.24 Pounds
Brand	Canon
Camera Lens	105 mm
Colour	Black
Continuous shooting speed	60 fps
Has image stabilisation	Yes
Included components	1 Piece
ISO Range	100-51200
Max Focal Length	105 Millimetres
Memory Slots Available	1
Min Focal Length	20 Millimetres
Minimum shutter speed	1 Seconds
Model year	2010
Plug profile	lens mount
Part number	2971C002
Size	full-size
Viewfinder Magnification	0.76x
Water Resistance Level	Water Resistant
Zoom Type	Optical Zoom
Lens Design	Zoom
Expanded ISO Maximum	200
Autofocus Points	45
Focus type	Auto Focus
Maximum shutter speed	1 seconds
Aperture Modes	f/22
Style	Hybrid
Effective still resolution	30.3 MP
Guaranteed software updates until	unknown

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