I don't want to remove the glass from the camera. One of Canon's best lenses. A characteristic confirmation of my words is its absence at flea markets (well, it is very rare). Pros below: Excellent optical performance. At an open aperture, sharpness is no worse than at 5.6. Build quality. Reliability. Price! Different cons: for 2.5 years of active use is not found. Dust and water do not get into it! (I use it actively on the street). Not very convenient for crop (216mm - too much).