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Viltrox's new $199 EF- to E-mount 'smart adapter' has built-in OLED display, full AF/EXIF support and more: Digital Photography Review
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Amazon.com : K&F Concept M42 to EOS Adapter, Updated Lens Mount Adapter for M42 Mount Lens to Canon EOS EF EF-S Mount Camera : Electronics
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QHY M42 Canon EF (EOS) Lens Adapter - 10 mm | High Point Scientific
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K&F Concept M10194 M42 Lenses to Canon RF Lens Mount Adapter - KENTFAITH
Adapter M42-CR for M42 mount lens to CANON EOS RF R5 R6 Mount Camera | eBay