Cap - 30mm to 86mm

Clip-on lens cap for camera lenses.

It is also advisable to equip all your lenses with it to protect your front optics from all shocks 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 49, 52, or 55mm thread...