UV Filter - 67mm to 86mm

The purpose of the Ultraviolet filter is to block UV rays, which softens atmospheric haze. This tends to protect outdoor images from the harmful effects of these rays.

It is also advisable to equip all your lenses with it to protect your front optic from all impacts and especially from dust and other scratches...

You can find out the filter thread size of your lens by measuring the internal thread; it does not correspond at all to the focal length: for example, a 50mm 1.8 lens can have a thread of 49, 52, or 55mm...