Canon 24-70 F2.8 soft images

[gercam]

The images from this lens have now become very soft - I think I read somewhere that there can be problems with this lens. Any advice/tests I can do?

 

[LongLensPhotography]

They need a trip to canon about every two years when used regularly. Heavy glass and plastic collars is not a great combination, but Canon thinks otherwise.

 

[ricky1980]

Heavy glass and plastic collars is not a great combination, but Canon thinks otherwise.