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Canon$ 160
These glass-backed holders accept up to three commercially available cut-to-size gelatin filters for rear-insertion lenses. For the EF 300mm f/2.8L IS II USM Lens and EF 400mm f/2.8L IS II USM Lens.
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Canon 52mm Drop-in Gelatin Filter Holder 52WII
These glass-backed holders accept up to three commercially available cut-to-size gelatin filters for rear-insertion lenses. For the EF 300mm f/2.8L IS II USM Lens and EF 400mm f/2.8L IS II USM Lens.
$ 160 MSRP
Shop at Canon paid link