The Nikon Coolpix L820 does not have a standard front filter thread on the lens, so you generally cannot screw a filter or hood directly onto the camera.

If you want to use filters or a proper hood, you’ll need an adapter made for the L820. One community answer notes that a Kiwifotos adapter/hood kit is available and uses 62mm filters.

So, in short:

• Direct attachment: no standard lens thread
• With an adapter: yes
• Filter size mentioned by the community: 62mm (when using that adapter kit)

If you only want shade from stray light, a DIY hood can also work, but it won’t give you a threaded mount for filters. Be careful that any hood or adapter doesn’t block the lens at wide angle, which can cause dark corners in the image.