Product description
Bushnell 16X52 telescope
view: 6.8 °
1000 meter event horizon: 120 m
lenses: 52mm
eyepiece: 42mm
the actual specification: 16X52
magnification: 16 times times the
exit pupil distance: 22.2 mm
exit pupil diameter: 4.3 mm
Coating: Blue film
lenses: optical
TTL auto focus: eyepiece focusing
color: black
weight: 338 grams
Carton gross weight: 19KG
Carton size: 38/38/38cm
Accessories: soft small nylon bag, moisture drier, lens cloth, hard corrugated box
using temperature:-40---+ 50 degrees Celsius
to save: dry environment preservation
The proper use of the telescope:
Transfer program length: distance between two telescope tube until until the left and right depending on the occasion of a circular field of view when pupil distance tube with the two pupil from the same to the human eye.
Focus: to close your right eye and left eye went out, rotating telescope adjustment mechanism (hand wheel or platen), until clear up; closed his left eye, right eye went out, adjust the right eye patch (left and right rotates slowly), so until clear.
Observation: the telescope to observe the target, slowly turn the regulating bodies, eyes will be able to see a clear target. For different distances of the goal, just adjust the regulating bodies, will be able to see the target.
Zoom telescope usage: first pull the Zoom lever to minimum ratio, using the above method to adjust. Until the goal is clear, pull the Zoom lever, the right to choose their multiples.
Maintenance of the telescope:
Buy telescopes should be paid attention to in the use process: when not in use store the place must bedry, telescope lenses come off easily after a long wet coating and lens fogging mold.
In the course of using, if dust or marks on the lens, do notdo not scrub with water!!! The best solution is to use the home often use cotton swabs (cotton) dipped in alcohol or gasoline, gently wipe. Generally best not to use wiping Buganda, and easy to scratch the surface of the lens.
Telescope you can see how far? Initial contact with the telescope's friends always like to ask this question. The answer is infinity. Common distance of telescopes is 60-1000 meters.
Telescope the distance associated with the person's Visual acuity : for example, the letters on the eye chart "e" keep out of 5 m worth of testing when people with good eyesight can see the bottom line, sighted people can only see a few lines above the "e". If you put an eye chart to 50 meters away, observed with a telescope of 10 times, the equivalent of 10 times closer, (and 5 meters distance). Good eyesight one can still see the bottom, nearsighted only see a few lines above the "e", the following is not clear. Sighted people will say the telescope to see less than 50 meters, even the following letters are not clear, and good eyesight would say the telescope is very good, even the sight of 50 metres away form the bottom of the letter can be seen, you can say that telescopes can only see 50 m???
Binoculars to see the distance to an object the size of the relevant : for example an Ant 1000 metres away, you use 10 times the telescope, or closer to Ant 100 metres, you don't see that, you can say that telescopes can't see the 1000 meters? If a person in 1000 metres away, observed with a telescope of 10 times, then equivalent to close to 100 meters, then we can certainly look at. The letters on the eye chart "e" placed 5 meters away when tested, people with good eyesight can see the bottom, like sighted people can only see the top few lines of"e". Why is that? Just because the bottom lines of the letter "e" is too small! Using a telescope can see the craters of the Moon 380,000 kilometers, but you don't see nearly enough of Earth satellites, it is because they are too small, is the truth.
Binoculars destined for the air quality : for example, using the same telescope, observe the goal of 1000 metres away, on a sunny day you can clearly see the target, and after the rain, cloudy day without sun, automobile exhaust in the air, dust and other circumstances, it may be unclear. One step closer, if there is fog, has a large number of suspended particles in the air, making visibility poor, you may watch less than 50 meters, which is the reason why fog blocked highways.
Multiply the telescope right for you?
In General, the ratio should not be more than 10 times the ordinary hand-held telescope, because holding a pair of binoculars will have a slight wobble, when observed through a telescope, will magnify this jitter, multiple higher jitter on the larger, a violent shake objects, the human eye is no way to see. Junyong reasons for General 7/8 times the magnification of a telescope. Even if the telescope is observed on the tripod, the multiple is also limited because ground construction and other factors influence the atmospheric density is not uniform, when the distance was observed reflections (or transmission, emission) shines through these uneven density of the atmosphere, light refraction occurs, causing image blur. And higher multiples of the telescope, this is more obvious. In General, in the city at low altitude, binoculars to not more than 40 times in multiples of times. Magnification, the actual field of view smaller. This is not conducive to finding and targeting, for constantly changing target observation especially disadvantaged. Even found the target, slightly shaking the tripod is easy to lose goals. No automatic tracking devices, often manually adjusted to keep the goal in sight. Improved multiple must also increase the diameter of the objective lens, to ensure that the image has enough brightness, no brightness of imaging the human eye is not clear. In this way, the size and weight of the telescope, as well as sharp increases in prices. So, not should one-sided of pursuit multiples, as market Shang many standard high telescope, multiples General are has exaggerated, also has less part multiples is really of, appeared this situation of reasons is simple, factory and businesses of primary purpose is pursuit profit, and not universal right of telescope knowledge, since market need high telescope, with Guide right of consumption views, also than to caters to this consumption views to of simple, generally caliber big some and multiples high some of telescope identify capacity high some, Porro Prism Binoculars roof Prism Binoculars than the higher resolution, coating well mirrors of high resolution. Needs to be emphasized is that only affects the number of times the resolution of the telescope one of many related factors, the blind pursuit of large multiples are not desirable.
How identify inferior telescope generally, inferior telescope has several typical features: 1, weight very light, this is because large used has plastic pieces to reduced cost, and plastic of density is is low of 2, plating red film, such can lied about telescope has infrared night depending on function 3, appearance colorful, such can lied about is high Junyong telescope, actually real of gaobei Junyong telescope Basic are is black of 4, see long time dizziness, this is because to improve production, No time to correct the two tube parallelism of optical axis 5, packaging simple, three 6 products, sales locations in small commodities wholesale market, or street vendors. Buy cheap telescope, not only suffer economic losses, used for a long time, the vision also have hurt.
In addition,never use a telescope to directly observe the Sun will cause great harm to eyes
