What are the ridged inner surfaces inside the Canon EF-EOS R mount adapter for?

Asked 7/2/2019

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The inside of the Canon EF-EOS R mount adapter has several concentric ridges rather than one smooth cylindrical surface. What is the purpose of these ridges? Are they mainly there to reduce internal reflections and stray light, or do they also help by giving dust more places to settle instead of reaching the sensor? Do other lens mount adapters use similar internal shaping?

stray-light canon lens-adapters mirrorless sensor-dust

Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0

Photography Stack Exchange contributor

7y ago

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Is it to keep dust out of the unprotected sensor by offering dust many alternative places to stick to, in case someone carries the mount adapter in the camera bag without caps on both ends?

Or is it to prevent light from reflecting from the walls of the adapter?

Yes.

Mostly the latter, but it would also help with the former.

Originally by user15871. Source · Licensed CC BY-SA 4.0

user15871

7y ago

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The ridges are primarily there to reduce internal reflections and stray light. A smooth inner tube can let light skim along the walls and bounce toward the sensor, which can lower contrast or contribute to flare. Adding ridges breaks up those reflections, much like the baffling used inside lenses, lens hoods, and camera bodies.

They can also help a bit with dust by creating more surfaces where particles may settle instead of traveling straight through, but that is a secondary benefit rather than the main design goal.

Yes, similar internal ridges or baffling are common in optical components and many adapters, especially where controlling stray light matters.

What are the ridged inner surfaces inside the Canon EF-EOS R mount adapter for?

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