Comfortably seals out ambient light
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<br />Self Locking mount keeps eyecup in place
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<br />Slides over eyepiece mounting rails
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<br />Eyecup rotates to accommodate right or left eyed shooters
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<br />Thanks to the Square Eyepiece converter, It is compatible for Nikon D5 D4S D4 D3X D3S D3 D810 D810A D800 DF D2XS D2X D2HS D1X D1H D1 DSLR Camera