A pivotal factor deterring Canon photographers from transitioning from their cherished EOS DSLRs to the innovative EOS R mirrorless cameras is the substantial investment they have made in an array of costly EF and EF-S lenses.
Photographers are quite attached to their glass, and persuading them to part with these treasured tools necessitates either a compelling incentive or a clever solution.
Recognizing this sentiment, Canon astutely introduced the EF-EOS R Mount Adapters concurrently with the launch of the first Canon EOS R mirrorless camera in 2018.
This lightweight 110g device empowers Canon users to retain their existing EF and EF-S mount lenses on the newer Canon EOS R mirrorless systems.
As articulated by Canon: “The Mount Adapter EF-EOS R facilitates seamless utilization of EF-S and EF lenses on EOS R cameras. Photographers possessing a collection of EF-S or EF optics can confidently invest in the EOS R System, assured that their existing lenses will perform as anticipated.”
Essentially, an investment in this £120/$150 adapter is poised to yield considerable savings — obviating the need to purchase numerous new lenses upon transitioning from DSLRs to mirrorless technology.
Moreover, it opens opportunities to procure budget-friendly secondhand lenses compatible with your new camera.
The adapter itself is compact, meticulously designed to connect between the EOS R camera body featuring an RF mount on one end, and an EF mount on the other, thereby accommodating your EF or EF-S lenses.
Having employed the EF-EOS R Mount Adapter with cameras such as the Canon EOS R5 Mark II, I have witnessed my once-archaic EF lenses experience a remarkable resurgence. Their performance exceeds expectations, noticeably surpassing results from my previous Canon EOS 5D Mark IV.
Remarkably, utilizing non-IS EF lenses with mirrorless bodies showcases enhanced performance, crediting the latest In-body image stabilization (IBIS) integrated into cutting-edge models such as the EOS R5 Mark II and R6 Mark III.
Thanks to the Canon EF-EOS R Mount Adapter, my EF lenses, including the professional-grade Canon EF 24-70mm f/2.8L II (2012) and Canon EF 16-35mm f/2.8L II (2007), achieve faster focus and deliver sharper handheld images, courtesy of the IBIS technology.
The tonal qualities and colors of my photos exhibit remarkable vibrancy when utilizing these legacy lenses on contemporary EOS R cameras.
The Canon Mount Adapter EF-EOS R also boasts weather-sealed construction against dust and moisture, featuring metal lens mounts at both ends, while its sleek black finish harmonizes with both your camera and lenses.

Thus, if you are contemplating a transition from your beloved EOS DSLR to the EOS R mirrorless system, there is no necessity to divest yourself of your EF and EF-S lenses — simply acquire the Canon Mount Adapter EF-EOS R!
I utilize the standard version; however, two additional variations exist, one incorporating a control ring for enhanced functionality, and another featuring a built-in filter tray, permitting the use of variable ND or polarizer filters with any lens.
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