7-17x30mm variable magnification large aperture single eye short focal telescope [K355]

**Hamlet Optical Series** **7-17x30mm variable magnification large aperture single eye short focal telescope [K355]** **Product Introduction** The short-focus macro telescope belongs to the Keplerian Telescope refractive optical system. It is an improvement on the Galileo telescope, changing the original concave lens eyepiece to a convex lens. It was originally used in astronomy and can be made into an astronomical telescope with a large field of view, high magnification but inverted imaging. Then a prism is added between the two convex lenses to convert the image into an upright one. In addition to the advantages of being light, thin, short and high-resolution, the two biggest features of short-focus macro telescopes are "Short Focus", which allows them to view the details of nearby objects at a very short distance; the optical system can also provide high refractive power, which is often used to assist patients with amblyopia and low vision to view distant objects. Suitable for low vision assistive devices, viewing classroom blackboards, bus numbers, street house numbers, weak eye vision training, museum exhibition tours, outdoor travel, flower and butterfly viewing, and insect observation. Hamlet's variable-zoom short-focus telescope [K355] can perform continuous stepless zoom, providing 7x to 17x real magnification. First use low magnification to find the target, and then adjust to high magnification to view details. The objective lens diameter is 30mm and the field of view is bright. The internal lens group is processed with MC (Multi-Coated) multi-layer coating, which provides sharp images and good contrast. The two-stage focusing mechanism of coarse and fine can use coarse focusing to quickly adjust the focal length to a rough image, and then use fine focusing to adjust to a detailed image. **Product Features** **Zoom optical zoom** https://www.hwatang.com.tw/uploads/product/content/f60ca351d184e387e6a83876d11504ec.jpg This product can adjust the zoom ratio and has stepless continuous zoom. The magnification range is 7x~17x. When using high magnification for a long time, it is recommended to use a tripod to reduce shaking. **30mm large aperture objective lens** It allows more light to enter, especially in dim light, to keep the vision brighter. **Multi-Coated** https://www.hwatang.com.tw/uploads/product/content/fdf62b720b77fc165e31c70cf76e055c.jpg Lens coating can reduce the loss of light caused by prism reflection, thereby increasing image brightness and contrast. "Multi-Coating" means that the internal lens group is coated with several layers of coating on the surface of the lens, and the imaging performance will be better than full-coating (Fully-Coated). **Twist-out eyecup** https://www.hwatang.com.tw/uploads/product/content/585e38d5ae90063f58c2dfd97793b19b.jpg Users who do not wear glasses can twist out the eyecup and place it lightly against the eye socket for the most comfortable observation. **Tripod hole design** https://www.hwatang.com.tw/uploads/product/content/4508cc126f184f1d05cce18e2a593f37.jpg The bottom of the camera body is equipped with a standard 1/4" tripod hole, which can be installed with various tripods as needed. It is suitable for users who want to observe for a long time, take photos and record videos, and those who pursue stability. **How to use** https://www.hwatang.com.tw/uploads/product/content/03635af08c846121c1798459845e98e0.jpg 1. Remove the eyepiece cover and objective lens cover. The rubber part is the eyepiece. If you observe with the naked eye, you can use it directly. If you wear glasses, please fold down the rubber part of the eyepiece. 2. Put your eyes lightly on the eyepiece and look at the target object for observation. Hold the eyepiece head with one hand and turn the focusing wheel on the body with the other hand to focus. The image will change from blurry to clear. 3. When the camera is retracted to its shortest position, it is telephoto, with an infinite focal length; when it is rotated to its longest position, it is macro, allowing for close-up viewing. https://www.hwatang.com.tw/uploads/product/content/4f276efcbf5696c6b5ebbd71361ccf1f.jpg **Precautions** ． The focal lengths stated in the specifications are actual test results, but may vary slightly due to individual vision conditions. ． Do not drop or subject it to strong impact to avoid displacement of the internal mirror assembly of the telescope. ． Do not look directly at the sun or strong light through the telescope, as this may cause damage to your eyesight. ． This product is not waterproof. Please avoid using it when it rains or soaking it in water. If it comes into contact with water, please wipe it dry as soon as possible and store it in a moisture-proof box. ． To ensure safety, please avoid viewing dangerous creatures such as bees, spiders, and poisonous snakes during macro observation. **Product Specifications** Original factory number: K355 Magnification: 7x~17x Objective lens diameter: 30mm Optical system: Keplerian Telescope Kepler Telescope Optical System Prism system: Roof vertical ridge prism system Lens material: optical white glass Lens coating: Multi-Coated Eye mask: twist-out eye mask Field of view: 4.6 degrees @ 7 times; 2.6 degrees @ 17 times Minimum focusing distance: 2.5m (body extended to its longest position) Maximum focus distance: Infinity (body retracted to shortest) Exit pupil diameter: 4.28mm~1.76mm Relative brightness: 18.3~3.09 Body material: plastic Tripod hole: Yes, 1/4" Body size: length 128-170x diameter 46mm Weight: 160g Accessories: waist storage bag, eyepiece cover, objective lens cover, hand lanyard, lens cleaning cloth Origin: Made in China **Brand Introduction** https://live.staticflickr.com/65535/53802868882_756aba87d7_n.jpg Since its establishment in 1984, Huatang Optical Industrial Co., Ltd. has been engaged in the manufacturing and import of various magnifying glasses, telescopes, compasses, optical microscopes and other products. It is the optical instrument company with the largest number of magnifying glasses in the country. We assist all walks of life to improve work efficiency, help many people with vision degeneration and eye diseases to see more clearly, and provide high-quality products to consumers at affordable prices. You don’t have to worry about spending a lot of money but not being able to buy suitable products. The year after the company was founded, we launched our own brand, "Hamlet Optics", to enter the international market. Our handheld magnifiers, portable leather magnifiers, and metal cloth magnifiers are the best tools that are sold both domestically and internationally and are well-known around the world. We continue to explore user needs and develop various innovative products, hoping that everyone can read comfortably and rediscover the joy of reading. Huatang Optics honestly provides product specifications and manufacturing origin information, so you don't have to worry about buying inferior products with greatly inflated magnifications, or products made in China being mixed with products made in Taiwan. https://www.hwatang.com.tw/uploads/editor/hwatang-company3-PL2.jpg?1497865948803