| The 50mm objective lenses of the 10 x 50mm DCF SP gather 56% more light than a 10 x 40mm binocular (and provide 25% higher resolution). This greater light gathering cuts through low light/overcast sky conditions to provide bright, clear images when smaller aperture high power binoculars have trouble even seeing a distant bird. Shore birds in the early morning mist, loons across a lake at twilight, raptors overhead at dusk – all are easy targets for this big, high resolution binocular. While they are big in performance, at only 29.6 ounces they are no heavier than many smaller performance, smaller aperture 10x binoculars. Like all the Pentax SP series, the 10 x 50mm SP uses sophisticated aspheric eyepiece lens elements for excellent resolution, a flat field, and low astigmatism. Features of this binocular . . . H-body roof prism with internal center focus. Lightweight magnesium-alloy body with noise- and shock-absorbing dark green and black rubber armoring. Fully multicoated optics for maximum light transmission. External lens surfaces have an additional scratch-resistant hard coating for added protection from scratches, dings, rough handling, etc. A hydrophobic (water-shedding) coating on the lenses helps keep water from forming large beads on the lenses during foggy or rainy observing, improving the image sharpness and contrast. Hybrid aspherical lens elements in its three-lens/two-group eyepiece design provide good edge-to-edge sharpness. A four-lens/three-group optical system in the objective lenses provides a sharp image. One and a half turns of the large ribbed focus knob moves from a good close focus of 11.5’ out to the horizon. Nitrogen-filled and O-ring sealed to be fogproof in all temperature extremes and waterproof to a depth of 1 meter. The inert nitrogen filling also prevents the internal formation of fungus in high humidity climates, such as rain forests. Phase-correcting prism coatings provide high contrast and resolution. This is particularly visible when looking sunwards, where more color and detail is visible in the shadowed areas of backlit or silhouetted birds. Twist-up rubber-rimmed eyecups retract into the binocular body for eyeglass use. The eyecups have four built-in click stops to more precisely match the eye relief to your eyesight. Objective lens covers are provided to protect the optics. The covers are tethered to the binocular body so they can’t be lost in the field, but can be removed if desired. A socket is built into the center hinge to let you connect an optional photo tripod adapter for extended no-strain tripod-mounted observing sessions. The continuously variable diopter ring on the right eyepiece allows you to match the binocular’s performance to that of your eyes. It can be locked in place so it can’t be accidentally knocked out of adjustment during use. A comfortably-large ribbed focus knob makes it easy to focus while wearing mittens or gloves. |
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