Problem with 400mm 5.6 L clarity

Image tests my 400mm 5.6 L is much less strong than my new 100-400mm lens. The only thing I can think of that would have harmed the 400 was condensaton in the body of the temperature changes. Shots are all tribod and cable triggered. No filter on either lens. Of course it's cropped way. Any ideas? The 400 is around the age of 9 months. Can be cleaned internally?

The top picture looks like PHEW, so in this case there is no way of knowing whether the goal is 'pointed'. You were perhaps too narrow?

Tags: Canon Camera

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