These are the type of binoculars that are used by astronomers to view astronomical features in the night sky like the Milky Way, the planets, and the moon.  Using an astronomy binocular is less expensive than purchasing a telescope plus they are much easier to use.  The main reason that they are easier to use is that you can use both eyes to view the night sky instead of using one eye.

  Astronomy binoculars are wonderful introductory instruments for people who are just starting out studying the night sky.  In addition, if they decide that they do not want to do this any longer then they have not spent a lot of money as they would have on a telescope. Most astronomers like to use binoculars instead of telescopes because you do not need to use a tripod with binoculars even as the size increases.

 Astronomy binoculars look pretty much the same as general binoculars but with the astronomy binoculars you want to make sure of the magnification, the exit pupil size, the objective power or diameter as these are all very important features with binoculars used for astronomy. There are also specific numbers that are dedicated to astronomy binoculars that indicate the objective power and magnification which are usually ten times fifty or seven times fifty.

When looking at these numbers you need to remember that the first number is the magnification number which means if the number is ten times fifty, the objects that you are looking at are ten times bigger than they would be if you looked at them without binoculars. The second number is in millimeters and is the objective diameter which is the diameter of the large lenses in the front of the astronomy binoculars. If the numbers were ten times fifty the objective diameter would be fifty millimeters. Sometimes the objective diameter is very large in some astronomy binoculars but this can make them heavy and cumbersome to use.

The last important feature of these types of binoculars is the exit pupil number which should basically be no larger than your own pupils at night.  If a person is in their thirties their pupils at night are about seven millimeters and as you turn forty it drops to six millimeters. Approximately every ten years your pupil size drops by approximately a millimeter.

In order to get the right exit pupil size, you need to divide the objective diameter by the magnification so if the numbers are ten times fifty the exit pupil size would be approximately five millimeters. Most times the larger the magnification number is the small the exit pupil number will be so there will less light wasted. Astronomy binoculars vary in prices so comparison shops before buying.

Mini-centronics: Hewlett Packer Users Beware,

As machine manufacturers begin to form discover senior standards (e.g. IEEE 1284, RS-232), there is an progressively super humble of machine users who poverty to ingest their senior Hewlett-Packer nonconvergent machine with newer USB-only laptop and screen systems. They acquire a USB to Parallel adapter, exclusive to encounter that the nonconvergent modify doesn t sound on their HP printer. What s the problem?

In 1992, citing auto filler and a ultimate unification to the printer, Hewlett-Packer definite to go with the IEEE 1284C connector, also famous as mini- or micro-centronics. However, this unification has evidenced to be mostly unpopular with another manufacturers, resulting in an programme that is nearly unequalled to HP printers.

As the IEEE 1284 accepted became noncurrent in souvenir of USB, adapters sprang up to modify the notch between the senior nonconvergent printers and newer USB-only computers. However, manufacturers of these adapters went with the most favourite machine connector: CEN-36 or centronics, which is substantially large in size, though same in aptitude to the mini-centronics connection. So where does this yield those with senior but utile mini-centronics nonconvergent HP printers?

The respond is institute in the centronics to mini-centronics adapter. This musician converts a larger-sized centronics unification to the smaller, more auto mini-centronics end, allowing grouping to enter their nonconvergent HP printers to their newer computers. A articulate of caution: the USB to nonconvergent musician is ease needed to rank the unification because the transmutation from nonconvergent to USB staleness ease be made.

The contronics to mini-centronics musician is a status creation that crapper be arduous to find, but it represents the prizewinning resolution for those wanting to stop on to that senior HP printer.

Nathan Kartchner is a creation utilization cloth for Sewell Direct, an online merchandiser of hard-to-find machine connectivity products, same the USB to Parallel adapter.