While I have set "Release Shutter Without Lens" on my Canon mirrorless camera (M5), I have never done so on any of the various Canon DSLRs I've been using for nearly 20 years. And, yes, I have used several adapted lenses on them without any problem. I've used both "chipped" and plain adapters over the years.
This website is pretty old now, but has been a pretty good resource for adapted lenses. Maybe it will help you.
I am not sure why you are getting that error, but a few possibilities come to mind.
- There is something wrong with that particular chip. It could be the programming or perhaps it's just not mounted correctly on the adapter, is misaligned with the connectors in the camera. You might compare it to the orientation of the contacts on the rear of an OEM lens, to see if you can spot any differences.
- It is my understanding that some of those chips can be user programmed so that image EXIF will display something that can help identify the lens. You note that the camera "thinks" a 50mm f/1.4 is mounted. If the camera is also thinking it's an autofocus lens, too, it may be the cause of the error you're seeing. You might contact the manufacturer of the adapter to see if they can help. Or maybe they have info on their website.
- The most useful thing the chipped adapters ever did for me was allow the camera's Focus Confirmation feature to work. But to do so the camera needed to be set up properly in advance and if I recall correctly I always had to mount an OEM autofocus lens to do the camera settings.... switching to One Shot mode (no Focus Confirmation in AI Servo mode), choosing Single Point or Spot (Precision) Single Point focus pattern, then selecting the AF point I want to use. None of this could be done when there was no lens on the camera or when the adapted lens was installed. It could only be done with an OEM autofocus lens mounted, which I then removed to install the adapted lens. Maybe one of these settings is incorrect and causing the error you're seeing. I don't recall ever having an error when I didn't have these set right, but I don't have a 5Ds so can't say maybe it's different.
- You say you are getting a "00 error"... are you sure it's an error? Is it displayed on the rear LCD screen with "ERR"? Or is it just "00" displayed on the top monochrome screen? If it's the latter, that's telling you the camera can't find the lens aperture to control it... it's NOT an error code, per se. This suggests you might have the wrong exposure mode selected. Adapted lenses have no means of communicating with the aperture of the lens, so you can only use M exposure mode, will need to set the aperture manually on the lens itself, and then manually adjust both ISO and shutter speed with "match needle metering" method (where you adjust to center the meter scale indicator on zero, if relying upon the camera's built in metering system). With adapted lenses you CANNOT use Tv or P or Auto or any SCN modes (if the 5Ds even has them). You MIGHT be able to use M-with-Auto-ISO or Av auto exposure modes. In other words, you cannot use any auto exposure mode where the camera would need to adjust the lens aperture... but may be able to use auto exposure modes where it is adjusting the shutter speed or the ISO.
I hope this helps, but have to admit I'm doing a lot of guessing!
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Alan Myers
San Jose, Calif., USA
"Walk softly and carry a big lens."
GEAR: 5DII, 7DII (x2), 7D(x2), EOS M5, some other cameras, various lenses & accessories
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