{"title":"Binocular Eyepieces","description":"\u003ch2\u003e\u003cspan style=\"font-weight: 400;\"\u003eWhat is an eyepiece?\u003c\/span\u003e\u003c\/h2\u003e \u003cp\u003e\u003cspan style=\"font-weight: 400;\"\u003eAn eyepiece is a multi-lens system that allows us to see things from both far away and close up. An eyepiece is therefore suitable for activities such as \u003c\/span\u003e\u003cspan style=\"font-weight: 400;\"\u003eastronomy\u003c\/span\u003e\u003cspan style=\"font-weight: 400;\"\u003e and medical research. The focal point of an eyepiece is miniscule, which helps make the picture parallel. This is vital for defined focus on planets and micro-organisms. \u003c\/span\u003e\u003c\/p\u003e \u003ch3\u003e\u003cspan style=\"font-weight: 400;\"\u003eMaximum magnification\u003c\/span\u003e\u003c\/h3\u003e \u003cp\u003e\u003cspan style=\"font-weight: 400;\"\u003eFor any viewing device with an eyepiece, a maximum magnification factor applies. When this is exceeded you'll get a blurry result. As such, this factor plays a crucial role in getting an object into defined focus. The magnification factor can be calculated by dividing the lens' focal distance by that of the eyepiece. So if this is, say, 500\/25, the factor will be 20. The magnification rule of thumb is that it must not be more than twice the diameter of the lens. So, if we have a lens measuring 50mm, we can maximally magnify 100x. When buying an eyepiece it is important to take this maximum magnification factor into account. \u003c\/span\u003e\u003c\/p\u003e \u003ch3\u003e\u003cspan style=\"font-weight: 400;\"\u003eNumber of lenses\u003c\/span\u003e\u003c\/h3\u003e \u003cp\u003e\u003cspan style=\"font-weight: 400;\"\u003eThe number of lenses an eyepiece comprises determines its functionality and performance. As such, we differentiate between eyepieces with two (Huygens), three (Kellner), four (Plössl) or more lenses. The more lenses there are, the more definition can be spread over a larger field of view. Meaning several objects can be observed in the one picture. In addition, high quality lenses can correct image aberrations, distortions and colour errors. A 60 degree viewing angle is par for the course nowadays. \u003c\/span\u003e\u003c\/p\u003e \u003ch3\u003e\u003cspan style=\"font-weight: 400;\"\u003eModern developments\u003c\/span\u003e\u003c\/h3\u003e \u003cp\u003e\u003cspan style=\"font-weight: 400;\"\u003eRapid technological developments to eyepieces over recent years have resulted in many changes. One option with some eyepieces is to directly forward captured images to a hard drive or laptop, meaning they can be instantly saved or viewed. Brands that closely monitor such developments are, e,g, \u003c\/span\u003e\u003cspan style=\"font-weight: 400;\"\u003eBresser\u003c\/span\u003e\u003cspan style=\"font-weight: 400;\"\u003e and \u003c\/span\u003e\u003cspan style=\"font-weight: 400;\"\u003eNikon\u003c\/span\u003e\u003cspan style=\"font-weight: 400;\"\u003e.\u003c\/span\u003e\u003c\/p\u003e","products":[{"product_id":"nikon-13-40x-20-60x-25-75xmcii-zoom-eyepieces","title":"Nikon 13-40X\/20-60X\/25-75XMCII Zoom Eyepieces","description":"Nikon oculair with multilayer lens coating and variable magnification, which is suitable for your Fieldscope III EDIII, ED82 and ED50. 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