Canon 100-400mm f/4.5-5.6 USM IS II

Started Jul 2, 2019 | Discussions thread
CameraCarl Veteran Member • Posts: 7,163
Re: Canon 100-400mm f/4.5-5.6 USM IS II

It is not unusual to have a bit of dust inside a lens. It is unusual to have a cracked element.  I would send it in to Canon for inspection and repair. When you get it back, try using it without a filter. There have been reports that filter use tends to result in unsharp images, but you day your images were sharp at first, so I don't know what to say.

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