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Posted 20 hours ago

Hawke Nature-Trek 10x25 Monocular - Green

£34.5£69.00Clearance
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About this deal

DIOPTER ADJUSTMENT: If you have differing prescriptions in each eye, you can adjust the left and right lenses independently, Once the Zygo test report has been completed, the optical alignment is thoroughly tested and tuned to ensure they are spot on before they leave us. At Rother Valley Optics, one thing we pride ourselves on is customer service and quality of our equipment. When we test your telescope, we will ensure that it is of the highest quality otherwise, we will reject the scope under our strict quality control and test another model for your peace of mind. One of the main values to look at when testing a refractor is the Strehl ratio. The higher this number, the higher quality lens you have. At Rother Valley Optics, we will guarantee the highest possible Strehl ratio for your telescope. We will aim to provide 0.95 Strehl or higher on Takahashi, RVO Horizon, William Optics and many more! Generally, the higher the Strehl ratio, the lower the Astigmatism and Coma meaning a better image quality from your instrument. We also measure the Power with our systems which is essentially the error from the reference sphere to the test optic. The reference sphere we use on our system is a very high quality sphere so the closer to zero the Power, the less error between the 2 elements thus ensuring a higher quality optical surface.

Optics are crisp and clear with notable natural colour reproduction. The smooth and precise rubber focusing wheel fits neatly against fingers and allows the image to focus at short distances down to 6.6ft/2m. The high grip green colour rubber armour ensures a secure hold in all weather conditions. PENTAX BINOCULARS SINCE 1938 Bringing together technology cultivated through the development of a wide variety of cameras and lenses, PENTAX binoculars have been viewing the world since 1938 Experience the clarity made possible by trusted optical performance and revolutionary coating techniques Visit 'HAWKE LIFE' : A lifestyle hub for the outdoor enthusiastFeaturing tips, techniques & advice from passionate sporting men and women Smooth and precise focusing with impressive depth of field ensure no details are lost when viewing at long or short distances.

HIGHLY VERSATILE These binoculars are designed for astronomy, bird watching, hiking, stargazing, traveling and sport Offering great visibility and brightness for both indoor and outdoor viewing You will also see some more values such as Astigmatism and Coma. Again, these are measured by the interferometer when we take measurements of the optical surface after adjustment. These are values which ideally would be at 0 but as our test optics are all curved lenses, there will always be astigmatism and coma present. The lower the number, the less of these aberations you will effectively see but with most refractors, you can buy field flatteners which will compensate for the coma anyway. The astigmatisms value is explaining the error between the symmetrical curvature of the lens. Basically, no lens will be perfectly symmetrical, the lower the astigmatism, the more symmetrical the lens surface is. Every Nature-Trek binocular features twist-up eye cups with three positions that allow the eye relief to be set correctly and ensure a full field of view. Other measurements such as the PV and RMS are important too. With these measurements, the lower the number the better as it shows less curvature on the lens. The flatter an optical lens, the better it will perform. The PV rating (Peak To Valley) is a measurement from the highest point (Peak) to the lowest point (Valley). From this we get the RMS (Root, Mean, Square). This is a similar figure to the PV and measured exactly the same way. The RMS is basically an average height difference from the PV so again, the lower the better. As you can see form the example below, we measured an RMS of just 0.027 wave which is a very good value. LIGHT AND COMPACT The lightest PENTAX binoculars in the range weighing around 195g As it is palm-sized and easy to use, it can be easily taken everywhere and is also suitbble suitable for sharing with children

Optics are crisp and clear with notable natural colour reproduction. The precise focusing wheel allows focussing down to 5m. BRIGHT AND CLEAR FIELD OF VIEW The optical system is multi-coated to prevent unnecessary light reflection, achieving excellent image performance with reduced flare and ghosting An ultra modern design encased in a textured green rubber. The robust construction protects against water, fogging and accidental drops. Every lens is fully multi-coated on both sides to ensure a bright, high resolution image that offers great light transmission and improved contrast.

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