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Cleaning the inside of my front element
Cleaning the inside of my front element Has anyone taken apart a Sigma SG DN 100-400? I have something that made it's way behind the very first element. Sigma said they can clean it but I would have to send it out. I use this lens daily and don't want to live without it for who knows how long. I just can't figure out the size screw that holds the front element on. Anyone have any ide...
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