52mm Drop-in Screw Filter Holder
The enclosed regular filter can be exchanged with other commercially available screw-type filters. Note that only filters with correct filter frame thickness can be mounted on the lens.
Accepts standard 52mm filters. Compatible with: EF 300 f/2.8L IS, 400 f/2.8L IS, 500 f/4L IS, 600 f/4L IS.