L series optics light and compact four stop image stabilizer constant f4 maximum aperture fluorite and ud lens elements super spectra coatings circular aperture for pleasing background blur compact manoeuvrable and lightweight the ef 70 200mm f4l is usm is a telezoom featuring the very finest in l series optical technology to deliver outstanding optical performance and operability four stop image stabilizer the ef 70 200mm f4l is usm features a four stop