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🔗 Unlock vintage glass magic on your Canon RF — manual mastery meets modern mirrorless!
The Hersmay M42-EOSR adapter is a precision-engineered, full-metal mount that lets you use classic M42 screw-mount lenses on Canon EOS RF full-frame mirrorless cameras. It ensures a perfect, wobble-free fit and maintains infinity focus, supporting lenses with floating elements. Designed for manual aperture and focus control, it empowers photographers to blend vintage optics with cutting-edge camera bodies for unique creative expression.
| Best Sellers Rank | #231 in Camera Lens Adapters & Converters |
| Customer Reviews | 4.2 out of 5 stars 93 Reviews |
M**O
Thumbs up
It works!
M**N
Perfect fit
Nice no nonsense adapter for M42 screw mount lenses to Canon. Great fit, nicely built.
B**Y
Doesn't Fit
This adapter is awful. It doesn't fit my vintage M42 lens because it only screws on a little less than halfway. Currently my lens is using a M42 to EOS adapter that fits just fine.
R**R
woks great
This item works great. I have however with some of my extension tubes issues. I am not certain if the extension tubes have the issue or this adapter. In any case I bought lots of extension tubes 30mm, 20mm, 10mm, 15mm, 12mm, 7mm, 3mm, ... and so on that work between themselves ok, However the 20mm and 30mm do not fit on the base, luckily the 10mm did perfectly fit so I could through a combination in different order create my 50mm I needed. This allows me to put then the extension on it so I can mount my microscope lens to the RF mount via the m42 rings. So overall I am very happy. Previously I had: RF-EOS <> EOS to M42 <> then all the different rings to get the right length, so I replaced with this the EOS adapter and the EOS to m42 adapter. I will now keep this together and have now a "dedicated" solution. Originally I 3-d print the adapter from RF to RMS, but as it turned out this did not work at all as my 3-d printer did not result in a mountable adapter to RF. Instead of reprinting one to EOS, I decided to just go with this ring and the extension tubes. I am very satisfied although I gave it not 5 stars.