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Anonymous
I'm looking to buy a used lens. The buyers says that there's a

"tiny air bubble near the rim of the rear element"

He says that it doesn't affect image quality. Should I be worried? I've heard of dust/fungus but not air bubbles.
>> BurtGummer !!RRMHFHglFsy
Ive got a fleck of what looks like metal in the back of one of my lens', but it doesnt affect the pictures at all.

Send him an email asking if he'll refund it if it does affect the quality of shots.

Remember your cameras probably a different set up to his.

If he says no then i would avoid, hes probably getting rid of a screwy lens for cheap.
>> Anonymous
>>215397
>refund
Good idea, I'm gonna ask him that now. I usually forgo the thought of a refund when making online purchases.

But, it is an air bubble which is transparent. I found this site http://www.glennview.com/lens.htm
that says that "air bubbles are not, as is often thought, a defect in photographic lenses." Donno how much credence I should put on the site since it's citing sources from 1919 and 1951.
>> Anonymous
"But do small bubbles actually cause a problem? The answer is similar to the answers about dust and scratches. They can act as a scattering center, possibly having a small effect on contrast, but they won't affect sharpness and probably won't visibly degrade the image at all. At the right (low) price, I wouldn't worry about one or perhaps even two small bubbles in a lens element. "

http://bobatkins.com/photography/technical/lens_condition.html