一眼レフカメラの偏光フィルター: https://www.amazon.co.jp/gp/product/B01N3SOKJO/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&th=1DJI Osmo Pocket2の偏光フィルター: https://www.amazon.co.jp/gp/product/B07N3X5G87/ref=ppx_yo_dt_b_asin_title_o00_s01?ie=UTF8&psc=1
http://www.nicovideo.jp/watch/sm43359392