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 High Definition Military HD Binoculars Telescope Weatherproof (20x50) +Pouch US $46.99 
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One of the most significant factor that needs to be considered before buying any telescope, especially in case you are new to astronomy, is what you're going to use the telescope for. With this in mind, it isn't always obvious that the physical properties of a telescope should be closely related to your requirements. Two of the most crucial parameters related with astronomical telescopes are the aperture (the diameter of the main objective lens or mirror) and also the focal length (the distance from the objective lens or mirror to the point where the image is formed). Having a little simple mathematics, you may conveniently calculate the values of these parameters to help you select the best telescope for your requirements.
Both of these sorts have their benefits and disadvantages. The 1 it is best to decide on is based on what you might be going to be making use of it for, and also how much money you've got to invest. One of the main rewards of a refractor telescope is that due to the fact the tube isn't open and you do not need to adjust a mirror, there's practically no maintenance involved. The high models of this sort have the most rugged designs, though also producing images which are among the sharpest and brightest which you will come across per inch. Mainly because the eyepiece is at the bottom where shorter individuals can see, this scope is well suited for youngsters in addition to the reality that they're built strong.
The 100mm aperture telescope is therefore capable of collecting 7850/50 = 157x more light, which is then accessible via the telescope eyepiece. In other words, seeking by means of the telescope will allow an observer to see objects which are 157 times fainter than could be seen using the unaided eye. Following the exact same calculation, the 150mm aperture reflecting telescope would allow the same observer to see objects which had been 353 times fainter than could be observed with the unaided eye. Clearly then, if you want to observe faint star fields or galaxies and nebulae, then a bigger telescope aperture is undoubtedly much better. For those who have a certain object in mind which you'd like to see, then understanding how faint it truly is ought to enable you to then 'work backwards' with the above calculation, to decide if the telescope you have would be suitable.
The disadvantage of reflectors is that they are not built as powerful and the mirrors have to be adjusted periodically. And mainly because they're not closed, dust and dirt can build on the mirrors that will have to be cleaned too. This sort isn't thought for children since they are much more fragile and they're far more challenging to reach due to the fact the eyepiece is at the best of the telescope.