Advanced rain cover for 300 f2.8 up to 600 f4 lenses [Separate eyepiece required]. The Hydrophobia 300-600 V2.0 protects a DSLR with a super telephoto lens (300 f2.8 up to a 600 f4) attached, with the lens hood in position. The Hydrophobia 300-600 V2.0 is designed to allow full operation of the camera while protecting it from the elements. In rain, snow, even blowing sand, the Hydrophobia 300-600 V2.0 gives photographers peace of mind!