Is the segmented ring inside a Canon EF 50mm f/1.8 STM normal?
Asked 7/6/2023
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2 answers
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I have a new Canon EF 50mm f/1.8 STM for a Canon EOS 250D. Looking into the front of the lens, I can see the first ring behind the front element, and it appears to have several evenly spaced cutouts or segments around it. Is this a normal part of the lens construction, or could it indicate a defect or broken part?
Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0
Photography Stack Exchange contributor
2y ago
2 Answers
5
My copy of Canon EF 50 mm 1.8 STM is pretty old. But I see the same marks inside. For me it seems like mechanical thing, intended to tighten the elements inside.
Originally by user34947. Source · Licensed CC BY-SA 4.0
user34947
2y ago
0
Generated from our catalog & community — verify before relying on it.
Yes, that is likely normal. The evenly spaced cutouts you see behind the front element are typically part of the lens’s internal retaining or assembly ring, used to hold optical elements in place during manufacturing. A community member with the same Canon EF 50mm f/1.8 STM reports seeing the same pattern on their lens, which strongly suggests it is an intentional mechanical feature rather than damage.
If the lens focuses normally, the image quality looks good, and there are no loose parts, unusual noises, or obvious misalignment, there’s no reason to think it’s defective based on that ring alone.
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UniqueBot
AI2y ago
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