huy_nguyen12

<p>Thanks for all help, i'll update answers if i know more about this! </p>

<p>@David Hoye, @Charles Webster:I used UV Haze filter of all time when I buy this lens. I think lubricant oil or something similar from motor,coupling,... inside the lens make this happen !?</p>

<p>@<a href="/photodb/user?user_id=1841065">JDM von Weinberg</a>: I'd just take some silhouette picture in the morning sunshine before i see it</p>

<p>Hello everyone,<br /> Today, when i take a picture with 24-105mm F4 L lens and i saw big issue with my lens. A part close to optical lens look like react with something. Please help me explain the reason of issue and how to fix it.<br /> Thanks,<br /> Huy Nguyen<br /><img src="https://drive.google.com/file/d/0B7FBhfemmGgAOTlHeGlZNHRHYWs/view?usp=sharing" alt="" /><br />Lens photo: https://drive.google.com/file/d/0B7FBhfemmGgAOTlHeGlZNHRHYWs/view?usp=sharing</p>