Can I leave the Canon EF–EOS R adapter on the camera when changing EF lenses?
Asked 7/3/2019
2 views
2 answers
0
Canon’s EOS RP manual says to attach the EF–EOS R adapter to the EF lens first, then mount the whole assembly to the camera. Similar advice is often given for teleconverters.
If I leave the EF–EOS R adapter on the camera body and only swap EF lenses, is that a problem? Does the order matter as long as the camera is switched off during the lens change? I’m mainly concerned about possible communication errors or any bad effects from changing lenses with the adapter left attached.
Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0
Photography Stack Exchange contributor
7y ago
2 Answers
2
Canon designed the firmware that's running the camera, so if they say an order of operation for something, it's probably best to follow it.
That being said, I'd imagine this particular order is due to the camera wanting to communicate with the lens, and if no communication occurs or that communication is disrupted, then an error is thrown until communication is reestablished. It's possible that one must "reboot" the camera in order to get it to attempt to communicate again, even after lens reattachment (As Canon recommends for recovery on the 5Dmk2 [I can't imagine it's much different for other bodies]).
At best, removing the lens from an extension tube, TC, or adapter and replacing with another will have no effect.
At worst, your camera will throw an error forcing a quick reboot. I can't say that I've really experienced this with my extension tubes (I don't have a TC or adapter), but I'm also in the nasty habit of powering down on lens changes (yes, it's an old habit but it's basically second nature for me at this point).
Structurally, there's nothing different about the attachment order of operations. If using heavy lenses, maintain support of the lens and not the body (which you'd be doing anyway).
Originally by user67377. Source · Licensed CC BY-SA 4.0
user67377
7y ago
0
Generated from our catalog & community — verify before relying on it.
In practice, leaving the EF–EOS R adapter on the camera and swapping only the EF lens should be fine if you turn the camera off first.
The main reason for Canon’s recommended order is likely reliable lens communication during mounting. If communication is interrupted or a lens is changed while the camera is powered on, the camera may simply fail to recognize the lens immediately or throw an error until you power-cycle it.
Based on the community answers, the likely outcomes are:
- best case: everything works normally
- worst case: the camera shows an error and needs a quick reboot
There’s no indication here of damage from changing the lens with the adapter left on the body while the camera is off. One user tested exactly that and reported the camera worked normally afterward.
So the practical advice is: switch the camera off before changing the EF lens, and if the camera ever seems confused afterward, restart it. That aligns with Canon’s general guidance to set the power switch to OFF when changing lenses.
Recommended products
UniqueBot
AI7y ago
Your Answer
Related Questions
Why does my Tamron 18-270mm show a black vignette on a Canon EOS RP with an EF-EOS R adapter?
Can I use Canon EF lenses on the EOS R5 with the EF-EOS R adapter?
Do EOS R/RP sensor microlenses reduce image quality with adapted EF lenses?
Will a Tamron EF 70-200mm f/2.8 work on a Canon EOS R/R5 with the Canon EF-EOS R adapter?
Are there third-party alternatives to the Canon EF-EOS M mount adapter?