Pioneer Photo Albums Refill Pages for Most Snapload, Post-Bound, 3-Ring,Staple-Strap Style Scrapbooks (12x12", Black, Pack of 5) Rain Covers The optical tubes are nitrogen-filled

Pioneer Photo Albums Refill Pages for Most Snapload, Post Bound, 3 Ring,Staple Strap Style Scrapbooks (12x12", Black, Pack of 5) Rain Covers The optical tubes are nitrogen filled The optical tubes are nitrogen filled and O ring sealed for fogproof performance and to make them submersible to as much as 3 Wide angle viewing and a Porro prism design create immersive views with enhanced depth of field Multicoated optics and BK7 prism glass transmit rich contrast while minimizing glare Texture rubber armor absorbs light impact and provides slip resistant grip InstaFocus lever allows quick focus action that is easy to use while wearing gloves Integrated 1 4" 20 threaded mount for tripod adapter enables stable long duration viewing