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ef 300mm f2.8 L non-IS internal gunk! cleaning internal elements

Started Aug 4, 2014 | Questions thread
hotdog321
hotdog321 Forum Pro • Posts: 21,141
Re: ef 300mm f2.8 L non-IS internal gunk! cleaning internal elements

mjkshots wrote:

does anyone have a good instructional video/photo/written explanation on how to open up and clean the inside of a 300mm f2.8L USM NON-IS LENS ? there is some stuff on one of the internal elements of this lens. check out the pics.. I think it is on the focusing element or possibly the element in front of that one. thanks for the help

Yikes! I own this same lens. Hope it's just dust and not fungus. I'd be interested in an answer, too, since I don't think Canon will service this pricey bad boy anymore.

 hotdog321's gear list:hotdog321's gear list
Canon EOS 5D Mark IV Canon EF 100mm f/2.8 Macro USM Canon EF 70-200mm F2.8L IS II USM Canon EF 24-70mm F2.8L II USM Canon EF 16-35mm F4L IS USM +3 more
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