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One day after using my Canon EF 28-70mm f/2.8 L USM Lens, I noticed that every photo has a huge amount of glow in the dark areas near any light area.

I tested my other four lenses to figure out if it's the lens's or camera body's fault. The other four lenses work fine without the glow problem.

I examined the problematic lens, and there seems no visible dust (observing front and back side of the lens).

Here's an example:

enter preformatted text here

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5  
I just want to be sure: do you have a protective filter on that nice lens? –  mattdm Jan 8 '13 at 13:24
    
What aperture did you shoot this at and were the other lenses as fast? –  Robin Jan 8 '13 at 21:13
    
I'd check to make sure that there weren't any grease 'smears' on the front or back elements. It's also possible, I suppose, that there could have been some internal condensation. Looks like the picture was taken someplace warm... Any trips to hotter/colder climates recently? –  BobT Jan 8 '13 at 21:57
1  
Maybe condensation/fog on the front or rear elements? –  cadmium Jan 8 '13 at 23:34
1  
If it's doing this with the filter off (and with everything else seeming good as everyone has said) send it in for repair. I'm a bit surprised, though, because the filter seemed the most likely offender. I'd double-check the result without the filter if you haven't already. If you have, time for the repair center. –  mattdm Jan 11 '13 at 12:41

2 Answers 2

up vote 5 down vote accepted

If it isn't a condensation issue, and it is repeatable, it's time to send the lens to Canon for repair.

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If you just stepped out of an air conditioned room you might have some short term condensation issue that creates these halos. –  uncovery Jan 10 '13 at 10:30
    
i guess that's what i'm going to do next ! but i kind of don't trust this services. –  armen Jan 11 '13 at 12:41
2  
You don't trust the company that MADE the lens? –  Paul Cezanne Jan 14 '13 at 11:11
    
of course i trust the company that made the lens, but here in Greece the service employees are a bit far from the service idea ! ... if i was in Japan, now that's a totally different thing. –  armen Jan 16 '13 at 8:15

the center doublet has some cement that gets cloudy when it breaks down. you need to find an independent repair shop that has a donor doublet that they can replace it with. its a common design flaw of the 28-70 2.8. repair should cost you $300-350. i had the same problem with the same lens. its not fungus. canon wont replace, as they dont carry spare parts anymore. time to make some phone calls.

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