I am new to DSLR cameras and recently I bought a Canon EF 75-300 IS USM lens to go with my new Rebel XT. To help protect the lens I also got a Cokin UV filter.
Well the image results were poor ( soft ) until I removed the filter, now the images are fine.
What I'm wondering is, would it be a poor quality filter that is causing the problem of soft images or is it the way this lens auto focus works with any filter attached?
I'm happy to purchase a "quality" filter to protect the lens, however it would be a waste of time and $$$ if the images just turn out to be soft again.