What is wrong with this lens?

<p>Canon EOS TS-E 90mm T/S lens producing foggy halos. Best seen when shooting streetlights at night.<br>

The lens shows no film or dirt on lens surfaces - front and rear. Cleaned several times. No fungus seen. Lens coating appears to be intact without scratches. I am the original owner - no misuse. Lens is probably >15 years old.<br>

What is wrong?<br>

See photos at http://jeffmiller.smugmug.com/Other/Temp/</p><div></div>

<p>Hmm, perhaps it's just the way it is. The reality, not the lens. Maybe it is just very light haze/fog that we don't see but your lens records. Have you tried a different lens in the same situation and gotten different results?</p>

<p>Are you shooting wide open? It looks like blooming from the extremely overexposed lights. Try stopping the lens down to f11 or f16 and see what happens, if you haven't tried that already.</p>

<p>With the star shapes of the lights it looks like the lens was already stopped down. </p>

<p>Could it be over exposed? Although it was taken at night time but you can clearly see the ground. Shoot it again -3 stops. v/r Buffdr</p>

<p>Could it be internal haze? I just had to send some medium format lenses off due to serious internal haze, turned out the lubricant had separated and deposited a film over the internal elements. </p>

<p>It looks to me like I see headlights at night with my eyes, the light bleeds a bit into halos. It seems to be expected, that the lights will spill over into the surrounding area on the sensor. Were you able to use this lens in the past without getting these halos, or is this a new kind of shooting?</p>

<p>Was there a strong temp difference between the lens and the air, or the cmos and the air? I have lenses fog up all the time, and sometimes the humidity inside the lens fogs the glass (depending on humidity and temp)... I've even had the CMOS fog up a couple times if the Camera is sig. colder than the air and you're swapping lenses...</p>

I agree it does look like mild misting on the front element, probably just needs a wipe.

 

If possible repeat the shot checking to wipe the front element before exposing, see if that solves it.

<p>Front and rear element are as clean as I can get them. Problem seems to be inside the lens or loss of a lens coating. Chris Nielsen's "internal haze" description seems to be the answer. Is my lens ruined or can it be repaired. Does Canon take these lenses apart and clean them?</p>

<p>check saturation and white balance, they might be way to high causing this. I like the shot, gives me sort of an eerie feeling. add detailed shot info on smugmug. your exposing for the building so the lights are blown out, plus if there is fog it will absorb light and cause the halos.it would look great if you bracket it and use hdrsoft</p>

<p> </p>