Can a Canon EF-M lens be adapted to a Raspberry Pi HQ Camera (C/CS mount)?
Asked 2/16/2023
9 views
2 answers
0
I have a Raspberry Pi High Quality Camera with a C/CS mount and want to use a Canon EF-M 28mm f/3.5 Macro IS STM lens on it. I haven’t been able to find an adapter, so I’m wondering whether this is possible at all, and if not, why not.
Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0
Photography Stack Exchange contributor
3y ago
2 Answers
1
Probably not.
There are two considerations: sensor size (ie. the target) and the flange focal distance.
Flange focal distance is the distance the lens needs to be from the sensor for images to be in focus. Imagine using a pair of binoculars. If you hold them away from your face and look thru them, everything is blurry, no matter how you focus. But put them up to your eyes and suddenly everything is in focus. For the binoculars, the flange focal distance is the distance from the lens to your eyes (kinda).
The EOS-M has an 18mm flange focal distance, and the C/CS mount lenses have a 17.5 Flange focal distance. This means that you would need to mount the EOS-M 0.5mm further from the lens than where the C/CS mount provides. So basically, a 0.5mm adapter. Perhaps this is trivial and will make no difference in actual image quality, but for sure the EOS-M lens is far far bigger than the camera module opening itself.
Another consideration is the sensor size. An EOS-M is designed to illuminate a sensor that is 23 x 14mm, whereas the C/CS illuminate one that is 6.287mm x 4.712mm. So the circle of light exiting an EOS-M lens is going to be much, much bigger than required, and likely far bigger than the hole provided for the camera module. Not a big deal, but you are only going to use a tiny central portion of the EOS-M lens to illuminate the tiny sensor. It's a bit overkill IMHO.
Originally by user4880. Source · Licensed CC BY-SA 4.0
user4880
3y ago
0
Generated from our catalog & community — verify before relying on it.
In practice, no—not as a simple adapter setup. Two issues matter:
-
Mount geometry / flange distance: EF-M and C/CS mounts are very different. While flange distance is part of the problem, physical fit and the lens’s rear protrusion also make adaptation difficult.
-
Electronics: The EF-M 28mm is an electronically controlled mirrorless lens. A Raspberry Pi HQ camera’s C/CS mount provides no electronic communication, so you would have no normal way to control aperture, autofocus, or stabilization. Even if you could physically mount it, the lens may not function usefully.
A purely mechanical adaptation is therefore unlikely, and any custom solution would require significant mechanical work and likely still leave the lens without proper control.
If you want to use lenses on the Pi HQ camera, it’s much more practical to use native C/CS lenses, or adapted fully manual lenses with simple mechanical controls.
Recommended products
UniqueBot
AI3y ago
Your Answer
Related Questions
Is the Raspberry Pi HQ Camera any good for astrophotography?
Can a Raspberry Pi HQ camera use a Canon 800mm f/5.6 with a 2x extender effectively?
Will an adapted EF circular fisheye be cropped on a Canon EOS M6 (EF-M)?
Why do my Raspberry Pi camera images shift color near the edges, and can it be corrected?
Do camera makers publish torque or load limits for lens mounts?