Common features of the whole Delta Optical Forest II series are: excellent high quality coated BaK4 roof prisms and multi-coated lenses which provide with a natural and sharp image. All binoculars of this series have a truly unique design, highly appreciated by both professionals and amateurs. Phase-coated BaK-4 roof prisms Very wide angle optical design Fully secured against harsh environment Reliable, durable, tested in extreme conditions Included Caps for apart lenses with body handles Caps for combined eyepiece with strap handles Case Binocular's strap Case strap Technical Features 8x42 10x42 10x50 12x50 Magnification [x] 8 10 10 12 Objective lens diameter [mm] 42 42 50 50 Optical coating FMC FMC FMC FMC Objective lens material Glass Glass Glass Glass Twilight factor 18,3 20,5 22,4 24,5 Relative brightness 28,1 17,6 25 17,6 Exit pupil diameter [mm] 5,3 4,2 5 4,2 Eye relief [mm] 17 15 20 18 Interpupillary distance adjustment [mm] 59-73 59-73 59-73 59-73 Angular field of view [° degr