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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 25 Nov 2011 (Friday) 09:09
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Canon metal lens mount material?

 
msowsun
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Nov 25, 2011 09:09 |  #1

I often see people incorrectly refer to the Canon metal lens mount as "Stainless Steel" and want to correct this misconception. (the camera mount does appear to be one solid material, so it would be easy to assume it is Stainless Steel, as is often reported)

I have taken apart a couple of lenses and discovered they are not Stainless Steel. If you remove the metal lens mount from a lens, and turn it over, you can easily see that they are made of Brass with some kind of plating applied.

The area of the mount that mates to the lens itself is left un-plated, or machined to an exact thickness. Various thickness shims can also be added for critical focus adjustment.

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pkim1230
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Nov 25, 2011 09:27 |  #2

now we are all 0.01% smarter.



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parabellumantonio
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Nov 25, 2011 16:53 |  #3

What about the L mount lenses?

and the 35 mm f/2? some people say it has stainless steel and another aluminum =(




  
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JohnB57
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Nov 25, 2011 17:02 |  #4

parabellumantonio wrote in post #13450695 (external link)
What about the L mount lenses?

They're made from the same brass but with a red stripe engraved on the inside so that Canadian airline pilots have something interesting to post when they're not cruising at 36,000 feet.

Edit - a word of empathy here. I had a similar moment of revelation when I dismantled my saxophone. I always thought it was made of gold-foil covered chocolate until I dismantled it and found it was actually brass. NOW I know why it took such a lot of sucking and never tasted very nice!




  
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yogestee
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Nov 25, 2011 21:20 as a reply to  @ JohnB57's post |  #5

Most of the older Nikkors were brass too.


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parabellumantonio
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Nov 25, 2011 22:02 |  #6

The brass have low friction




  
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Perfect_10
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Nov 26, 2011 00:07 as a reply to  @ parabellumantonio's post |  #7

Surely it's made of brass because it's easy to machine and very easy to electo-plate


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joeseph
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Nov 26, 2011 00:26 |  #8

parabellumantonio wrote in post #13450695 (external link)
What about the L mount lenses?
(

part CY1-2178-000 shown above is for 70-200mm F/2.8L IS

thanks for the info Mike! we won't ask why you were dismantling lenses... (but I'm picking it's something to do with EF mount conversions)


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melcat
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Nov 26, 2011 00:26 |  #9

The claims online that they were aluminium were not believable. Brass is a much better material for this.




  
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c2thew
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Nov 26, 2011 01:04 |  #10

looks like brass with thick chrome plating since chrome is much more resistant to oxidation.


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FLiPMaRC
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Dec 09, 2011 13:31 as a reply to  @ c2thew's post |  #11

:cool: Interesting!


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absplastic
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Dec 09, 2011 14:48 |  #12

All the metal Canon lens mounts are nickel-plated brass (like most keys). Plating chrome over nickel is generally only done for cosmetic reasons, to give high shine and the characteristic blue tint, but it's not desirable on mating components since chromium is brittle and prone to peel/flake off.


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CanonCameraFan
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Dec 12, 2011 17:37 |  #13

Stainless Steel has a quality called "galling", it has a tendency to rip as 2 Stainless Steel surfaces mate against each other. Stainless Steel Nuts and Bolts are quite often assembled with a special grease known as "Anti-Seize" or "Nevr-Seize" (trademark name) to prevent this phenomenon.

I appreciate it when people share what they discover, and hope the community does too and encourages it. Not everyone knows what everyone else does. The detail of the mating surfaces being bare brass, was good trivia!


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JonK
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Dec 12, 2011 18:15 |  #14

They're nickel plated brass


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c2thew
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Dec 12, 2011 19:41 |  #15

i stand corrected.

really quite amazing the amount of parts in a canon camera lens/body/point and shoot.


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Canon metal lens mount material?
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