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I currently have my Canon 5Dc in a local shop to have the sensor cleaned. I just got a call from the service repair rep who says that there are marks on the anti-aliasing filter that they cannot clean off. 3 options: leave the marks on the filter, replace with a new filter, or take off the filter. My question is which would be the best option? Do the marks affect image quality? Is it worth it to replace with a new filter (not sure if it's expensive but it sounds expensive)? Do, I need the anti-aliasing filter in the first place? The service rep who contacted me said that it was needed or else it would also cause detection of infrared rays? I was under the impression that it was mainly used for jaggies and moire. Any information regarding this situation would be appreciated. Thanks.