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Opticron Discovery WP PC 8x50 Binoculars, Black

£99.5£199.00Clearance
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In fact, the field of view is so wide – on the 10×42 it’s 7.6-degrees and the same as older EL 8.5×42 – that you can step up in magnification without the usual pitfalls of doing so. We generally prefer 8x binoculars over 10x or 12x binoculars because, normally, they strike a better balance between magnification and field of view. These binoculars, however, give you the best of both worlds. The 8x NL Pure have an even wider field of view at a frankly unbelievable 9.1-degrees. Fogproofing: To prevent binoculars from fogging up when transitioning from the cold outdoors to the warm indoors, manufacturers fill their binoculars with an inert gas (usually argon or nitrogen) that has no water content and thus inhibits condensation. They’re exceptionally sharp across a wide 7.6° field of view and no discernible chromatic aberrations. They offer a touch more magnification than a regular 8x binocular, yet they’re not at all difficult to hold steady and close focus is superb: you can peer at subjects from 1.5m. Focusing is incredibly easy on the finger, too. The focus wheel is both light and smooth and super accurate. Porro and roof prisms: All binoculars use prisms to keep the size down, otherwise they’d all be huge and look like a pair of telescopes strapped together. Prisms come in different flavours, though, and the type of prisms used dictates the shape and size of your binoculars. Traditional A-shaped binoculars use Porro prisms. Porro prism binoculars tend to be larger and bulkier than roof-prism binoculars, but slightly cheaper. More modern H-shaped binoculars use roof prisms. These are the most popular type in use today because they tend to be smaller and lighter than Porro-prism optics. At higher levels of magnification, it’s hard to hold binoculars steady enough to see a stable image. A higher magnification also usually means a narrower field of view. Field of view (or FOV), incidentally, is another figure usually stencilled on the binocular somewhere. It’s normally expressed in degrees and refers to how much you can see from left to right when you’re peering through them. What is the best magnification level for bird watching or astronomy?

To evaluate an expression containing x, enter the expression you want to evaluate, followed by the @ sign and the value you want to plug in for x. And we’re a little disappointed with the accessories supplied in the box. The strap isn’t padded, bizarrely you don’t get lens caps for the objective lenses, and the rubber, non-adjustable, roll-down eyecups won’t be to everyone’s taste. Even the ocular lens caps aren’t tethered. However, for that stupendously good image stabilisation we’re willing to forgive a lot. Enter your queries using plain English. To avoid ambiguous queries, make sure to use parentheses where necessary. Here are some examples illustrating how to ask about factoring. Proper fraction button is used to change a number of the form of 9/5 to the form of 1 4/5. A proper fraction is a fraction where the numerator (top number) is less than the denominator (bottom number). Despite this, and a comparatively reasonable price, the Trailseekers are well-designed and well-built and they come with a generous selection of extras. The tough-feeling green rubber housing is fully waterproof and the eyecups are adjustable in three stages, with eye-relief stretching all the way out to 17mm.If we instead try a value that doesn't work, say x=3 (try 2x+3=7 @ 3), Algebra Calculator shows a red "not equals" sign instead. Normally we wouldn’t recommend using a pair of 12x magnification binoculars without a tripod but with stabilisation these work just fine, and are optically splendid. They present a sharp, bright image right out to the very edge of your field of view with neutral colour representation. British gunmakers BSA produced sporting versions of the Lee–Enfield military rifle, chambered in "8mm (.315")" from well before World War I until at least the 1930s. The British-founded "Rifle Factory Ishapore" continues to manufacture Lee–Enfield sporting rifles in this chambering. If you’re mostly going to be stargazing or mounting your binoculars to a tripod, you can get away with larger lenses. 7×50 and 10×50 pairs are popular for moon exploration and constellation-hopping, while 12×60, 15×70 and 20×80 pairs will take you even deeper into the night sky, although they start getting too heavy for realistic handheld use.

Algebra Calculator can simplify polynomials, but it only supports polynomials containing the variable x. What’s most impressive, though, is the range of accessories on offer here, with a neoprene-padded strap, high-quality carry bag, lens cleaning cloth and even a shoulder harness all supplied in the box. True, you don’t get such luxuries as extra-close focusing (take the 2.5m close focus claim with a large pinch of salt, it’s actually longer than 3m), and they’re quite soft at the edges of the field of view. The strap and carry pouch are basic, and eye-relief is a low 13.6mm. Glasses wearers would be well advised to try these out before buying. My only complaint is that the focus adjust wheel is a little stiff and needs a fair bit of effort to shift. Oddly, the diopter adjustment wheel, which is handily located just behind it, is far easier to tweak.

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Waterproofing: You’re going to be using your binoculars outside so it’s best to be sure that they won’t let in water if you’re caught in a rain shower. They’ll fog up and condensation will form on the inner surfaces if this happens. In summary, then, an 8×42 pair of binoculars magnifies a scene 8x and has 42mm lenses; a 10×25 pair has 10x magnification and 25mm lenses. Should I care about features such as prism types or ED glass? In 1893 the loading was once again updated with the perfection of a completely smokeless powder by the Austro-Hungarians. This new loading was designated "8mm M.1893 scharfe Patrone", it was loaded with the same bullet as the two previous loadings but used a 43 gr charge of the new Gewehrpulver M.1892. This improved ballistics slightly to 2,035ft/s (620m/s) out of the M.88/90 and later M.95 long rifles, it was about 200ft/s (61m/s) less out of the repetier-carabiner M.90 and M.95.

If you would like to create your own math expressions, here are some symbols that Algebra Calculator understands: A polynomial with rational coefficients can sometimes be written as a product of lower-degree polynomials that also have rational coefficients. In such cases, the polynomial is said to "factor over the rationals." Factoring is a useful way to find rational roots (which correspond to linear factors) and simple roots involving square roots of integers (which correspond to quadratic factors). However, the binoculars themselves feel solidly made, they’re light and portable and offer screw-out eyecups – a lot more than you’d expect for the money. After you enter the expression, Algebra Calculator will print a step-by-step explanation of how to solve 3x+2=14. Close focus: Great for spotting insects and inspecting flowers from close range. The best binoculars let you focus from as close as 1.5m away.

Math

They’re cheaper, too, than the Trailseekers and feel better made, with a smoother focus dial and longer 22mm eye relief, so they’re better for glasses wearers, although we’re not too keen on the cheap-feeling lens caps. These are roof prism binoculars, waterproof and although they don’t use extra low dispersion glass (ED) like the Nikons, the glass is fully multi-coated to reduce flare and glare. These are also fully waterproof to the extent that they can be submerged in up to 3m of water. Throw in a 30-year warranty and you have a pair of binoculars that are likely to last you a long time. What’s more, you’re not just getting decent optics, but a solid, rubber-armoured build, smooth focusing and a comfortable, lightweight design. Sure, at 900g the Aculons weigh more than most equivalent Roof Prism binoculars, and they do get tiring over prolonged use, but compared to some budget 10 x 50s, they’re well-balanced and easy going. Nikon also bundles a case and a comfy padded strap. The sweet spot for birdwatching and nature-spotting binoculars is 8x. This gives you a reasonably broad field of view (usually around seven to eight degrees) and a good level of magnification, and you’ll be able to hold them easily without getting too much distracting shake.

The size of the objective lens is most critical to the quality of the image you see through your binoculars. The larger the lens, the greater its light-gathering ability. Too small and the image will be murky and dim; too big, though, and the binoculars will be too bulky and heavy to be practical. Still, if the best-quality image is important to you, they’re fantastic for the money and represent a big step up from the cheaper Olympus 10×25 and RSPB Puffin 8×32 models below. For sports or hiking, where you’re more likely to be viewing in full daylight or under bright stadium lights, you can get away with a smaller objective lens as long as the magnification isn’t too high. 25, 26 and 30mm pairs fit into this category, with 7x, 8x and 10x magnification.

Key specs – 10x magnification; 42mm objective lenses; 7.6° field of view; 18mm eye relief; adjustable cups; 2m close focusing distance; 850g The other terms you might hear connected with binoculars and see on specifications sheets are Porro prism, roof prism and ED glass.

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