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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 12 Sep 2014 (Friday) 18:31
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White square?

 
Andy ­ R
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Sep 12, 2014 18:31 |  #1

Why is there a white square on the back of some of the L lenses?? I've always wondered! Lol


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JWdlft
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Sep 13, 2014 14:30 |  #2

Are you sure it's an L lens?

As far as I know:
My Canon 60D crop camera has a red dot and a white dot on the lens mount.

Canon EF-S (crop lenses) have a white square on the lens. You line that up with the white square on the lens mount of a crop camera when attaching it. I do know Sigma made-for-crop also have a white dot to line it up.

EF lenses (I'm guessing it's all EF and not just L) have a red dot to align with the red dot on a crop or full frame camera. I have no 3rd party full frame lens to check that with.
Anyway, IF there's a white square on a FF lens you might need to align it on a crop? No idea, my L lens has no white square, I just align red with red.




  
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Andy ­ R
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Sep 13, 2014 23:21 |  #3

I meant this square, like found on the 17-40 f/4l

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Reservoir ­ Dog
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Sep 13, 2014 23:30 |  #4

i don't have any white square on my lenses (just checked)
Made in Taiwan ? may be...


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Canon ­ Bob
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Sep 14, 2014 04:18 |  #5

Andy R wrote in post #17152876 (external link)
I meant this square, like found on the 17-40 f/4l

It's the gel filter mount template...you'll find it on a few wide angle lenses

Bob


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Reservoir ­ Dog
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Sep 14, 2014 04:38 |  #6

Andy R wrote in post #17152876 (external link)
I meant this square, like found on the 17-40 f/4l

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HTTP response: 404 | MIME changed to 'image/gif' | Byte size: ZERO

Ho this square (i didn't see the picture the first time ??? ) i thought a little one like the red dot
I confirm, it's for the gel, i've the same on the 15mm fisheye, this square help you to cut the filter gel at the good size ;) (it's a reference)


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White square?
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