2.5x13 magnification attachment for binoculars

This 2.5x13 monocular accessory considerably increases the range of application of all current Vixen binoculars: when simply pushed onto one of the binoculars' eyepieces, that eyepiece's magnification is increased by 2.5 times - so 8x42 binoculars then become a 20x42 'telescope'. The 21.4mm eye relief also allows observing with spectacles. The multi-coated optics of the BinoBooster minimizes light loss and loss of contrast.