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Excited to be coming to practice astronomy, I decided to compile below, some things I learned turtle back zoo about binoculars during this time. Some go completely against what I imagined when I started practicing astronomy. I hope to help those who want to buy a pair of binoculars.
The first thing you need to know is that there are binoculars sold from street vendors for 20 to 40 reais. They are pure garbage, made with plastic lenses. Compare the quality of these binoculars with something decent turtle back zoo is a joke. In many cases you see better without them than with them. If you want to buy a good pair of binoculars in Brazil, accept that you will have to pay a couple hundred dollars. Do not make the crime of giving a binocular 30 real to your child, much more if it is interested in astronomy. Unless you want to just forget it this practice.
The harsh reality is that binoculars have crazy prices in Brazil. Binoculars found for $ 300 a Brazilian store, costs about thirty turtle back zoo dollars in the United States. A costing 2000 real here, costs about $ 300 there. Moral: products seen as high level here, as some binoculars brands Orion or Celestron, are seen as toys in the United States, while the products seen by them as being quality, seem to the English aristocracy products for us.
It is when you look at the night sky you really discovers the optical quality of a binocular. Products that look perfect when you're turtle back zoo looking at a landscape during the day reveal their weaknesses to be appointed to a planet or star overnight: the image does not come together, chromatic aberration spreads, reflexes pollute the image, the stars to deform move closer to the edge of the field of view. Even binoculars 200 or three hundred will present real problems in looking at the night sky and you'll understand why there are those that cost about 2000 dollars.
Something that will leave you confused, you find that increase has a totally different meaning than you thought. The first thing you will hear from experienced practitioners turtle back zoo when buying binoculars is "much increase is bad and little increase is good!". You will take to accept this, but it will soon understand that a binocular with very dark and absurdly increase has blurred image, and a narrow field of view, making a great difficulty turtle back zoo to find and watch what you want. You will find that the best increases are between 7 and 11 times. Above that you will need a very large and heavy glasses and a robust and high tripod.
In the beginning you will also hear about BAK4 prisms and BAK7 and will not understand what the difference is, the only thing I understood is that all experienced say BK4 is best for those who want to use the binoculars for astronomy, sometimes without explaining the law why. When you look at a star with a pair of binoculars with BK7 prism and see how it deforms approaching the edge of the image, you'll understand the difference.
A very common type of nonsense that you will find on sites like "Free Market" turtle back zoo are things like "Binoculars with a range of 1km." It exists and who describes his binoculars so usually does not not the slightest knowledge about the product they are selling. Binocular is a product made by lenses. What they do is give more power to your eyes, without changing its basic characteristics. As your eyes, binoculars can see to infinity if there is nothing in front of the opaque object.
If you are in order to find a good pair of binoculars on the Internet, be aware of the addresses of the two most respected sites of Brazil: www.astroshop.com.br www.armazemdotelescopio.com.br. I believe a good pair of binoculars to get into astronomy has the following characteristics: Prisms BK4. increased between 7 and 11 times. opening turtle back zoo between 50 and 63mm weight of up to a pound. Fully multi-coated turtle back zoo lenses Visual comfort above 11 mm if you do not wear glasses turtle back zoo and about 20mm if you use.) Price between 200 and 400 dollars. Good luck with your purchase
In my teens fed the dream of having a telescope or even binoculars to see the stars, but not