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Pentax 65809 PCF II 12x50 Waterproof Binocular

Pentax PCF WP II 12x50 Binoculars 65809 Binoculars


NEW PENTAX 65810 20 X 60MM PCF WP II BINOCULARS (BINOCULARS)

20 X 60MM MAGNIFICATION; WATERPROOF & NITROGEN-FILLED (JIS CLASS 6); SUBMERSIBLE UP TO 1 M; ALUMINUM DIECAST BODY FOR STRENGTH & DURABILITY; LONG EYE-RELIEF; MECHANICAL FOCUS LOCK ALLOWS USER TO LOCK IN AT A SPECIFIC DISTANCE FOR CONVENIENT FOCUS-FREE VIEWING; CLICK-STOP DIOPTER ADJUSTMENT LOCKS IN RIGHT EYEPIECE DIOPTER SETTING; RUGGEDLY CONSTRUCTED; RUBBER HOUSING PROTECTS THE INTERNAL OPTICAL & MECHANICAL SYSTEMS; HELICOID EYEPIECE RING WITH 4 CLICK STOPS GIVE THE MOST COMFORTABLE EYE RELIEF; LIMITED LIFETIME WARRANTY


Essential Optics Review for the Boards

About the Book

This is the new Second Edition with chapters on low vision and vision rehabilitation to help readers prepare for the oral boards. There is a chapter on contact lenses by Ali Bukhamseen, OD, FAAO, FIACLE, Chief of Optometry Department, Saad Specialist Hospital, Al-Khobar, Saudi Arabia.

Dr. Wilkinson is co-author of Protect Your Sight and author of Essential Optics Review for the Boards. Dr. Wilkinson is a clinical professor of ophthalmology in the Carver College of Medicine at the University of Iowa. The Department of Ophthalmology and Visual Sciences there is consistently ranked as one of the best ophthalmology teaching programs in the United States. Dr. Wilkinson serves on the Executive Committee of the American Optometric Association Low Vision Rehabilitation Section and the Planning Committee of the National Eye Institute’s National Eye Health Education Program. He has published extensively and spoken all over the globe concerning issues related to visual rehabilitation. He teaches optics to the ophthalmology residents at the University of Iowa and around the world.

About the Author

Dr. Wilkinson’s optics course at the University of Iowa helps residents survive the Ophthalmic Knowledge Assessment Program (OKAP) exam and boards. Now, in book form, his material will help residents and students ace optics. His book is concise and complete with over 150 questions to guide the student through optics. The book utilizes diagrams to teach and provides a high-yield review of optics that’s needed for success on the boards.

Don’t take the boards without this book!


LensPEN Lens Cleaning System

Keeping your lenses spotless is one of the most crucial steps to high-quality photography. After all, just the slightest imperfection -- such as dust, fingerprints or water stains -- can mean the difference between a stunning portrait and an unsalvageable mistake. Unfortunately, lens cleaning systems do not always provide photographers with a reliable, convenient solution. Microfiber cloths can often leave dust and debris behind, compressed air won't clean fingerprints or other stains, and "wet" cleaning kits that rely on cotton swabs and liquids are often somewhat cumbersome (and often leaky). The answer is a product that removes dust, erases smudges, won't leak, won't leave residue, and is 100% safe for all lenses. The answer is the superior lens cleaning system for fine optics... the Original LensPen! The unique design makes cleaning your lens fast, simple and effective. On one end, a retractable soft brush sweeps dust and loose particles away from the glass. On the other end, a special dry cleaning compound is used to gently remove fingerprints and spots. The result is a crystal clear lens surface and better pictures in just seconds, a feat that other cleaning items just can't match. It is absolutely 100% safe for all lenses, even those with multi-coated surfaces, and its unique, self-replenishing cleaning compound will never spill or dry out like other lens cleaning systems. It is environmentally friendly and non-toxic, and because it is no bigger than a highlighter, the LensPen stows easily in any bag or slips right in your pocket. No sprays, no chemicals, no residue, all in a convenient, portable, environmentally safe package. Best of all, it's very affordable, and will endure hundreds of cleanings without losing any of its effectiveness. The original LensPen is recommended for use with any device with a diameter of more than 13mm, including all interchangeable camera lenses, camcorder lenses, binoculars, scopes and more.


Bushnell Powerview 8x21 Compact Folding Roof Prism Binocular (Black)

Bushnell PowerView binoculars offer the best of both worlds, combining contemporary styling and design with traditional Bushnell quality and durability. This particular PowerView binocular offers an 8x magnification and a 21mm objective diameter. The fully coated optics, meanwhile, guarantee superior light transmission and brightness, helping you see just about any target, whether you're searching for birds or trying to get a better view of the stage. And users will love the easy-to-use center focusing system, which adjusts quickly to keep your subject in sharp view. Additional features include a nonslip rubber armor housing that absorbs shock while providing a firm grip, a neck strap and a carrying case for easy transport, and 9mm of eye relief.

Specifications: Magnification: 8x Objective lens diameter: 21mm Size class: Compact Focus system: Center Prism system: Roof Prism glass: BK-7 Lens coating: Fully Field of view @ 1,000 yards: 378 feet Close focus distance: 21 feet Exit pupil: 2.6mm Eye relief: 9mm Eyecups: Fold down Waterproof/fogproof: No Adapts to tripod: No Weight: 7 ounces Warranty: Limited lifetime

Tech Talk
Objective Lens: The diameter of the objective or front lens. The larger the objective lens, the more light that enters the binocular, and the brighter the image.

Field of View (F.O.V.): The side-to-side measurement of the circular viewing field or subject area. It is defined by the width in feet or meters of the area visible at 1000 yards or meters. A wide angle binocular features a wide field of view and is better for following action. Generally, the higher the magnification, the narrower the field of view.

Roof Prism System: In roof prism binoculars the prisms overlap closely, allowing the objective lenses to line up directly with the eyepiece. The result is a slim, stream-lined shape in which the lenses and prisms are in a straight line.

Olympus 7X21 PC III Classic Binocular (Blue)

This new classic version of the popular 7x21 PC III features a stylish Classic Blue body color and features new rubber grips for a steady and comfortable performance. With built-in dioptric correction and a compact, portable design that makes it ideal for all-around outdoor use including bird watching, hiking, and travel


Pentax 62216 Papilio 8.5x21 Porro Prism Binocular

Named for the Latin word for butterfly, PENTAX Papilio 8.5x21 binoculars are the perfect choice for insect observation in the field and in museums and galleries. The enhanced observation capability of the Papilio binoculars is made possible by a PENTAX Convergent Lens Optical System Engineering (CLOSE) mechanism. The CLOSE mechanism automatically slides the left and right objective lenses toward the center when the focus is fixed at a short distance. Revolutionary dual-axis, single body housing with synchronized eye-piece adjustment to assure correct optical alignment for comfortable viewing Fast and easy center focusing for handling ease Helicoid eyepiece rings for extra viewing comfort Fully multi-coated optics to eliminate harmful ultraviolet rays while improving light transmission for high contrast images with no glare or flare High quality BaK4 prisms transmit more light at the edges to enhance illumination for easier viewing in dim light Included Accessories - Eyepiece lens caps, Case, Neck strap Binocular Type - Porro-prism, center focusing Lens Construction - Objective Lens - 2 elements in 1 group Eyepiece Lens - 5 elements in 5 groups Magnification - 8.5X / Objective Lens Diameter - 21mm Field of View - Real - 6.0 degrees /Apparent - 51 degrees / Field Of View At 1000 Meters - 105m / Field of View at 1000 yards - 315 ft. Diopter Adjustment Range - +/- 4 m -1 / Diopter Adjustment - Click-stop adjuster built in right eyepiece Dimensions (Height Width) - 4.6 x 4.3 inches (116 x 110mm) Thickness - 2.2 inches (55mm) / Weight - 10.2 oz. (290g) Pentax Limited lifetime warranty