Optics Lens Argon

Vortex Optics Razor Binoculars $849 The Razor binoculars take advantage of the latest engineering and high-definition glass technology to deliver incredible natural color distinction, brightness from dusk to dawn, and razor-sharp detail.Features:Vortex VIP unconditional lifetime warrantyHD System: Delivers extremely sharp images with the latest XR lens coatings, XD lens elements, XT optical design, ArmorTek lens armorXR Lens Coatings: Vortex XR proprietary anti-reflection lens coatings increase light transmission with multiple coatings on all air-to-glass surfacesXD Lens Elements: Extra-low dispersion (XD) glass enhances resolution, color, and contrastXT optical designArmorTek: Ultra-hard, scratch-resistant coating repels oils and corrosive salts on outer glass surfacesFogproof: Filled with argon gas to inhibit internal fogging over a wide range of temperaturesWaterproof: O-ring seals prevent moisture, dust, and debris from getting inside the tube for reliable performance in all environments

Lens (Optics) $73.28 High Quality Content by WIKIPEDIA articles A parfocal lens is a lens that stays in focus when magnification/focal length is changed. There is inevitably some amount of focus error, but small enough to be considered insignificant.Zoom lenses (sometimes referred to as true zoom) are ideally parfocal in that focus is maintained as the lens is zoomed (focal length and magnification changed), which not only is convenient, but also has the advantage of allowing more accurate focusing at maximum focal length and then zooming back to a shorter focal length to compose the image. However, not all socalled zoom lenses are actually parfocal. Author: Surhone, Lambert M./ Tennoe, Mariam T./ Henssonow, Susan F. Binding Type: Paperback Number of Pages: 92 Publication Date: 2010/09/29 Language: English Dimensions: 5.98 x 9.01 x 0.22 inches

Utopia Optics Too Dirty Blue Replacement Lens $11.99 Utopia Optics Too Dirty Blue Replacement Lens.

Utopia Optics Too Dirty Clear Replacement Lens $11.7 Utopia Optics Too Dirty Clear Replacement Lens.

Night Owl Optics Nexgen 4.0x Zoom Lens $100.99 4x Lens Night Owl Optics Optics Nexgen 4.0x Zoom Lens P-OBJNO4X Zoom www.nightowloptics.com

Bushnell Matte Elite Tactical 5-15x40 Argon AO MilDot Riflescope ET5154 $421.49 Our top-of-the-line offerings being the new Elite 6500-inspired options with a 6.5x magnification range. Features: A great long-range shooting instrument with a front parallax adjustment, Adjustable objective, Sunshade, Parallax setting from 10yds. to infinity, RainGuard HD, Ultra Wide Band Coating, Fully multi-coated optics, “Blacked-Out� cosmetics, Target turrets, and All the same great features found in our Elite products, now offered to our “Elite� personnel. Power / Obj Lens 5-15x 40mm. Reticle Mil-Dot. Weight 21 oz. Length 14 inches. Field of View (ft@100 ft. / m@100 m) 21/6.3@5x / 7/2.1@15x. Eye Relief (in / mm) 3.5 / 89. Click Value in@100 yds / mm@100m .25 / 7.

Utopia Optics Slayer Pro MX Blue Replacement Lens $12.6 Utopia Optics Slayer Pro MX Blue Replacement Lens.

Utopia Optics Too Dirty clear Mirror Replacement Lens $16.65 Utopia Optics Too Dirty Clear Mirror Replacement Lens.

Utopia Optics Slayer Pro Blue Snow Goggles with Persimmon Lens $53.99 Utopia Optics Slayer Pro Blue Snow Goggles with Persimmon Lens.

Night Owl Optics NexGen II Monocular 50mm (plastic lens) NOXM50 $206.09 Night Owl Optics NexGen II Monocular 50mm (plastic lens) NOXM50

E1224 1.25-4x24 Elite 30mm Argon Riflescope - Matte $399.18 Bushnell 1.25-4x24 Elite 4A Illum Reticle Matte 30mm Riflescope E1224 is a compact low profile design that is perfect for short to medium range targets. There is simply nothing brighter than the Elite line of Bushnell riflescopes, and the 1.25-4x24 Illum 4A Argon Riflescope E 1224 is no exception. The Ultra Wide Band Coating from Bushnell takes precision optics to a whole new level with 95% light transmission with 300% more of the visual light spectrum than before. The most unforgiving environments cannot stand up to the Bushnell Elite 1.25 - 4x24 Matte Illuminated 4A Rifle Scope, thanks to its RainGuard HD protection and Argon purged riflescope body.

E3950B Elite 3-9x50 Rainguard HD Argon Purged Riflescope - Matte $350.18 Bushnell 3-9x50mm Elite Argon Matte Rifle Scope gives you the versatility and optics to be a successful big game hunter. The 3-9x 50mm Elite Argon Matte Riflescope is inspired by the Bushnell riflescope tradition of building open the collective quality of past riflescopes, and utilizing groundbreaking innovation to deliver an unmatched result. The advantage of Bushnell Elite is industry leading 95% light transmission with Ultra Wide Band coating, unbeatable fogproofing with Rain Guard HD, and outstanding waterproofing with Argon purged treatment. The 3-9x50 Elite Matte Rifle Scope from Bushnell features extra light gathering capability thanks to a large 50mm objective, so you can make the most of dawn and dusk.

Spy Optics Logan Sunglasses Lens $74.95 Fitting like a glove and ready to lead you into the fray, the Spy Optics Logan Sunglasses feature a sleek, dense propionate finish that is all business. With wraparound styling, these baby's go aerodynamic on a straight line cliff shot, bike trail bender, or during motor assisted access. An 8-base Arch lens maintains clear vision with a natural eye curved designed, while a gnarly tough and light Grilamid frame keeps you floating like a butterfly, so you wont get stung like a bee after a mega jump or anticipated crash landing. A built-in hinge system gives cool styling and a head hugging fit. Give 'em the love.

Beyond Optics Contact Lens Case Blue and Pattern $4.99 Contact Lens Case Blue and Pattern

Beyond Optics Contact Lens Case Gold and Pattern $4.99 Contact Lens Case Gold and Pattern

Beyond Optics Contact Lens Case Green and Pattern $4.99 Contact Lens Case Green and Pattern

Leupold - VX 3 Scopes - Cheaper Than Dirt Sells Leupold

Binoculars for Birders

Binoculars for Birders

With the beginning of Spring Migration it is time to consider investing in new binoculars. This is a proposition that can present itself in daunting ways. Careful consideration needs to be made whether a new birder or one who has spent some time in the field and acquired some expertise. The optics field is quite large and the number of products is considerable. How does one choose a binocular? Here are my suggestions.

First, determine just how and under what circumstances you will be using your new binoculars. If you are going to be walking then full size binoculars are certainly worth your consideration. However, if you are a backpacker or will be doing your birding on a bicycle, then you may wish to consider mid size or even compact binoculars. If you bird by sitting in a favorite spot, then larger binoculars could be your choice. Size matters when one considers the mode of birding. Size is dictated by the objective lens. Generally, if the objective lens is 50 mm then it is considered to be a large binocular; if it is 42 mm, it is full size; if it is 32 mm, it is a mid size. Finally, compacts have objective lenses 25 mm or less.

The size of the binocular will probably affect the way they feel in your hands. One should consider the ergonomics of one’s choice. In other words, does the model you are examining have the right heft? Do you feel comfortable while holding the binoculars to your eyes?

Coupled with the size of the objective is the light gathering ability of the lens and the field of view. Of course, the larger lenses tend to gather more light. The more important consideration should be the field of view. Those new to the game should consider obtaining a pair of binoculars that posses a large field of view. Field of view is often stated in feet viewable at 1000 yards. For example, the Stokes Talon has one of the largest field of view for its size lens, 420 ft. at 1000 yards.

One of the most significant advances in optics is in water and fog proofing. This has been accomplished in two ways. The first of which is changing the prism design. Roof prism binoculars are so much easier to water and fog proof because of internal focusing. The older porro prism design has external focusing and, therefore, is not easily water or fog proofed. The other facet to proofing is the gas used to purge the binocular.

Two gases are currently being used, nitrogen and argon.

Nitrogen and oxygen, if you remember, are the major components of air. Oxygen is the active ingredient while nitrogen is not. This basic chemistry is the reason for choosing nitrogen as the purging agent in many models. However, the real advancement is in the use of argon.

The Argon Binocular is the newest class of binoculars. Argon is a member of the Noble Gases. Noble Gases were at one time called the Inert Gases because of their inability to react. In fact, they are so unreactive that it was not until the 20th Century that they were even discovered. The point is that argon is now being used because it does not attack the o-rings and seals in the binocular, thus allowing for excellent water and fog proofing and extending the life of your binocular.

One more word…in my opinion, one should be prepare to purchase a binocular worthy of your endeavors. Spend the money on a pair of binoculars that you can afford. Do not waste your hard earned cash on a pair of cheap ones. This advice is given in much the same vein as buying all the house you can afford. Let’s face it; you are going to possess these binoculars for a long time. You want to be able to see the bird with clarity and ease. You want to become adept at identifying a bird correctly. So, you must be able to see it in all conditions, including some adverse situations. Your willingness to increase your budget will often provide you with a return in performance of your purchase.

These tips hopefully will lend themselves to your benefit. Enjoy your new binoculars and spend as much time as you can in the field.

About the Author

Roy Smallwood is the owner of Kingbirdfeeders.com. Roy began this enterprise after a 26 year career as a teacher of science. His love and enjoyment of the outdoors and birding in particular is the impetus for the company. He is an active member of the Central Texas Audubon Society. He encourages everyone to participate and enjoy birding whether in the backyard or in the field. Visit www.kingbirdfeeders.com for , binoculars and spotting scopes and happy birding!