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Author Topic: Canon 100mm f2.8 L is owners, dust circle inside lens?  (Read 2015 times)

fohtohz

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Canon 100mm f2.8 L is owners, dust circle inside lens?
« on: May 02, 2012, 01:27:53 AM »
Hi all, I just got a 100L and was looking down the front of the lens through to the rear under a light and noticed what seems to be a weird circle of stain or dust on the inside of the lens(around the edge and 2/3s near back element), was wondering if anyone with the same lens has the same thing.

This lens is supposed to be weather sealed and the stain is not on the back element, so was wondering what it was. Apart from this strange circle, everything functions great, maybe it's a reflection off something. thanks

« Last Edit: May 02, 2012, 01:29:29 AM by fohtohz »

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Canon 100mm f2.8 L is owners, dust circle inside lens?
« on: May 02, 2012, 01:27:53 AM »

iaind

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Re: Canon 100mm f2.8 L is owners, dust circle inside lens?
« Reply #1 on: May 02, 2012, 02:39:34 PM »
Had mine for 18 months and still dust free
5DIII + BGE11 / 5DII + BGE6 / 40D + BGE2N /8-15 4L / 17-35 2.8L / 24 3.5L TS-E /24-70 2.8II L / 24-105 4L IS /Zuiko 50 1.4/ 100 2.8L Macro IS / 70-200 2.8L /180 3.5L/ 300 4L / 100-400L

fohtohz

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Re: Canon 100mm f2.8 L is owners, dust circle inside lens?
« Reply #2 on: May 02, 2012, 03:52:39 PM »
mine doesn't really have dust, it's more like a circle of gray stain or glue on the outer edge inside the lens itself, it doesn't show looking from the rear element, only when looking from the front with a light and with aperture blade wide open.

have to look carefully, no one else has this??

ideaworx

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Re: Canon 100mm f2.8 L is owners, dust circle inside lens?
« Reply #3 on: May 02, 2012, 04:16:24 PM »
All clear here, not seeing this ring
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neuroanatomist

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Re: Canon 100mm f2.8 L is owners, dust circle inside lens?
« Reply #4 on: May 02, 2012, 04:20:02 PM »
No 'ring' except I do see the edge of the iris diaphragm.
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imkev

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Re: Canon 100mm f2.8 L is owners, dust circle inside lens?
« Reply #5 on: May 03, 2012, 03:29:56 AM »
Mine looks clean too...Might want to think about swapping it out if you just got it.
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swrightgfx

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Re: Canon 100mm f2.8 L is owners, dust circle inside lens?
« Reply #6 on: May 03, 2012, 09:49:59 AM »
Is it fine white powder? (No, I am not implying Canon or the retailer are involved in drug trafficking!)

I have seen this before. It is from some sort of low-density plastic or rubber, from what I gather, probably as an agent to keep it dry enough not to harbour fungus (think talc). From what I have read, it being of the amount that it is visible is rare (perhaps limited to a particular batch), but is also quite stationary and "stuck" to the surface upon which it sits. I guess it isn't a good idea to throw your lenses around, which would likely loosen it, but that probably applies white dust or not.

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Re: Canon 100mm f2.8 L is owners, dust circle inside lens?
« Reply #6 on: May 03, 2012, 09:49:59 AM »