I want to buy 8 42 telescopes around 350 and recommend a cost effective 20

Beijing Galaxy Telescope will answer for you:

At present, the domestic binoculars are relatively good, especially the binoculars, the series and models are more, and the reputation is also good.

For binoculars, the higher the magnification, the better, the magnification of binoculars is 7-10 times, if the multiplier is too high, a slight shaking of the hand will affect the observation effect. In terms of caliber, it is relatively better around 50, with a large aperture and a large observation field of view and high comfort.

Here are some things to keep in mind when buying binoculars:

Two parameters are important to choose binoculars, one is the aperture, one is the multiple, like 7x50, or 8x42, and one: the number before the X number is the multiple.

Ordinary binoculars, the multiple is more than 7-10 times, generally not more than 12 times, if the multiple is higher, it will tremble when held, affecting the observation effect, 10 times the telescope to see the scene at 100 meters, which is equivalent to 10 meters in front of you (100 divided by 10 times, 7 times is equivalent to the feeling of getting closer to 14 meters) The feeling of the naked eye.

2: Caliber: The number of amps behind the X number is the caliber.

If you want to observe a large area, it is recommended to choose a large aperture, in ordinary binoculars, 50 aperture is relatively large, but the large aperture telescope is relatively large.

Three: the ratio of caliber and multiple:

Brand model recommendation:

Binoculars are based on different brands, parameters, and performance, and the gap is also very large, so you can choose the right one according to your own use and economic situation.

Low-end binoculars are recommended:

Boguan surfing series, like 7x18, 6x18, 8x22, 8x25 of the mountain eagle series, these are relatively elementary binoculars, very practical, the appearance is more fashionable and beautiful, the volume is relatively small, very easy to carry, more suitable for watching concerts and ball games, and also suitable for young people and students, ** are below 200 yuan.

Low-to-mid-end binoculars are recommended:

Boguan Hunter 7x50 and Traveler 10x50 These two reputations are very good, the caliber is large, the multiple is more reasonable, ** is also moderate, about 400 yuan, cost-effective, very suitable for travel and sightseeing, belongs to the mid-end binoculars are more affordable, the shape is relatively mature, suitable for men.

Mid-to-high-end binoculars recommended:

Boguan hollow 8*42 and optimistic 10x42, these two series are metal mirror bodies, themselves are waterproof and anti-fog, the viewing quality is very high, the imaging is sharp, the definition is high, the coating technology is also very good, and the quality is high. **Around $1000. Binoculars that belong to the mid-to-high-end.

You can go to the Galaxy Telescope Knowledge Zone to see, you can directly search for "Galaxy Telescope", there is a lot of relevant knowledge about the purchase, maintenance and use of telescopes.

8*42 good.

It must be 8 42 good, because 8x has a wider field of view than 10x, and if there is no special need, 8x is enough for observations in daily life.

Many military telescopes are only 8 times, so the higher the magnification, the better, too high your field of view will be very narrow, and it is actually not easy to use.

The role of the telescope:

A telescope is an optical instrument that uses lenses or mirrors and other optical devices to observe distant objects. Light rays that are refracted through a lens or reflected by a concave mirror allow them to enter a small hole and converge for imagery, and then pass through a magnifying eyepiece to be seen. Also known as clairvoyance.

The first purpose of a telescope is to magnify the opening angles of distant objects, so that the human eye can see details with smaller angular distances. The second function of the telescope is to feed the beam of light collected by the objective lens that is much thicker than the diameter of the pupil (up to 8 mm) into the human eye, allowing the observer to see faint objects that were previously invisible.

Telescope Maintenance:

1. Ensure that the telescope is stored in a ventilated, dry and clean place to prevent mildew.

2. The remaining dirty spots or stains on the lens should be gently wiped with a professional lens cloth to prepare for the scratch-free mirror, if you need to clean the mirror, you should use absorbent cotton to occupy a little alcohol, wipe from the center of the mirror along a square to the edge of the mirror, and constantly replace the absorbent cotton ball until it is clean.

3. The telescope is a precision instrument, and it is important not to fall, press or do other strenuous actions on the telescope.

4. Non-professionals should not try to disassemble the telescope and clean the inside of the telescope.

5. Do not collide with sharp objects, such as iron nails, needles, etc.

6. Pay attention to moisture-proof and waterproof when using telescopes. As a precision instrument, the telescope should be avoided in harsh conditions as much as possible. Lianxiang <>