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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 07 Nov 2017 (Tuesday) 14:44
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Canon 60mm macro diaphragm blades

 
gouzou
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Nov 07, 2017 14:44 |  #1

Hello to everyone,

I have a question regarding the canon 60mm f/2.8 macro lens.
I have taken a look at 3 copies of this lens and I have noticed that when looking through the lens from the front side (lens not attached on camera) and while rotating the focus ring, one of the diaphragm blades is not aligned with the rest. Instead, it "protrudes" to the front. That is, the diaphragm has not a perfect circular shape.

I attach a photo to show that.


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Is this technically normal? Because this produces distorted circles on the bokeh, which doesn't seem right to me.

Any thought welcome. Please share your experiences with this lens. I wonder if this exists to any copy.

Thanks,
John



  
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greenjeans
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Nov 14, 2017 19:34 |  #2

Just took a look at mine and it is the same as yours. Must be normal.


Gripped 6D, gripped 6D2, gripped 70D, gripped T3i, 24-105 F4L, 50mm 1.8 STM, 55-250mm, 18-135mm, 60mm EF-S macro, 70-200 F4L IS, 400mm F5.6L, 18-55mm IS STM, Canon 85mm 1.8, Sigma 150-600mm C., Sigma 100-400mm C, Samyang 8mm 3.5 fisheye

  
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FEChariot
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Nov 19, 2017 13:16 |  #3

greenjeans wrote in post #18496638 (external link)
Just took a look at mine and it is the same as yours. Must be normal.

Mine doesn’t have it. Must be abnormal.


Canon 7D/350D, Σ17-50/2.8 OS, 18-55IS, 24-105/4 L IS, Σ30/1.4 EX, 50/1.8, C50/1.4, 55-250IS, 60/2.8, 70-200/4 L IS, 85/1.8, 100/2.8 IS L, 135/2 L 580EX II, 430EX II * 2, 270EX II.

  
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Canon 60mm macro diaphragm blades
FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
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