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Old May 19, 2010, 6:20 PM   #1
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Default Spot on back of Canon EF 70-200mm f/2.8, anyone know what it is?

I just got a Canon EF 70-200mm f/2.8 L (IS) USM off of eBay and during inspection I found this circular "dot" on the glass on the back of the lens. It is very close to the edge of the lens where the contacts are. It is so perfectly round that I assume it was put there during manufacturing for a reason and I also assume that it is so close to the edge of the glass that it does not even affect what the sensor sees.

I am unable to find anything like this on any of my other Canon lenses.

Any ideas as to what it is or if I should be concerned?

If you have this lens, can you check the back of yours for comparison?
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Old May 20, 2010, 6:06 AM   #2
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Turns out a little cleaning and it is gone!
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Old May 20, 2010, 7:35 AM   #3
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That's good news. I saw the thread last night so was too lazy to post but glad it is sorted. Basically there should be nothing on the glass as it can very slightly affect the image in a certain area, especially at narrower apertures.

Glad you fixed it.
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