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The most significant factor that needs to be considered before purchasing any telescope, specially for anyone who is new to astronomy, is what you might be going to use the telescope for. With this in mind, it's not always obvious that the physical properties of a telescope really should be closely related to your requirements. Two of one of the most crucial parameters associated with astronomical telescopes are the aperture (the diameter of the major objective lens or mirror) as well as the focal length (the distance from the objective lens or mirror to the point where the image is formed). With a little easy mathematics, you can very easily calculate the values of these parameters to assist you decide on the most beneficial telescope for your wants.
The telescope aperture is representative of what's often described as the physical 'size' of the telescope. The larger the aperture, the more light gathering capability the telescope has. As an example, a recommended aperture for a genuinely valuable first telescope could be at the least 100mm for a refracting telescope, or 150mm for a reflecting telescope. Employing these figures, we can then calculate how faint an object an observer could be able to see: The entrance pupil of the human eye can reach roughly 8mm in diameter when totally adapted to the dark. This is equivalent to an area of 50 square millimetres (50mm 2). The refracting telescope having an aperture of 100mm in diameter has an location equivalent to roughly 7850mm 2. Stargazing is one of the most fascinating hobbies and top quality merchandise like the Prism Waterproof Binocular on this page will make the experience even extra magical.
Will someone please tell me how to pick out a pair of binoculars?
I need it explained in simple, easy-to-understand language.
Perhaps explain the differences as to roof prism, porro prism, wide angle, degree of angle, what the X's stand for, as I don't know how to look for a small waterproof pair which brings things way up close to use on a ship or for birdwatching.
Perhaps a certain brand and type can be suggested? I believe Bushnell are suppose to be very good but are they pricey because of the name? I see a lot of Nikons and wonder if they may be the best buy? (I am leary of Olympus because they have so many remanufactured products out there).
Any and all suggestions and info will be much appreciated. Thank you.
Also, please explain the field of view, angle of view and if some can be attached onto a tripod without an adapter.
And, should I look for fogfree lenses only?
Would ATB (allterrain) ones be best because they are more durable?
First roof vs porro. Roof prism binos are those binos with two parallel tubes, they're straight out, very compact, very sleek. Porros, are the classic bino shape, there's an offset between the rear(occular) lens and the front (objective) lens. Here's the rule of thumb, for binos under $150, stick with porro. Porros are easier to make, hence for cheaper binos they usually have better quality glass. Above $150 then it's all roof territory, because they're more waterproof and well people just like them better cause they look prettier.
The field of view of a bino determines how much area you can cover. Usually given in something like 400' at 1000 yards. This is important if you use it for birding or when you need to scan an area for something. If you already know where your object is and just need a better look, it's not that big of a deal. For birding you want to find binos with the biggest field of view.
There are a few other things you need to look for. These are the things generally listed on the box.
1. First, lens coating. There are 3 levels of coating, from best to worst they are, Fully Multi Coated, Multi Coated, and Fully Coated. Sometimes only marked as FMC, MC or FC.
2. Prism type, BK-7 or BAK4, BAK4 are generally better than BK-7
3. For magnification, stay with binos under 10x, anything above will require some type of image stabilization or be mounted on a tripod.
4. For roofs, look for binos with phase correction, sometimes noted as PC-3.
For use on a ship though you might want one that has image stabilization, those are expensive.
Bushnell are well priced, they have some crappy binos and some very good ones. I own a pair of Bushnell Legend in 8x26, awesome pair for the price.
Nikon make great binos, but they do have some crappy one out there also. I don't much care for their action series, but their travelite series are great.
The 100mm aperture telescope is as a result capable of collecting 7850/50 = 157x far more light, which is then readily available by means of the telescope eyepiece. In other words, looking by means of the telescope will enable an observer to see objects that are 157 times fainter than could possibly be observed with the unaided eye. Following the very same calculation, the 150mm aperture reflecting telescope would allow the exact same observer to see objects which were 353 times fainter than could possibly be observed with the unaided eye. Clearly then, if you would like to observe faint star fields or galaxies and nebulae, then a bigger telescope aperture is absolutely far better. If you have a certain object in mind which you would like to see, then realizing how faint it is should permit you to then 'work backwards' using the above calculation, to establish if the telescope you've got would be suitable.
The focal length of the telescope is representative of either the physical 'length' of the telescope, or its optical configuration. A brief focal length will give a wide field of view (the location of night sky that could be seen), with the objects in that field of view appearing tiny, whereas a long focal length will give a narrow field of view, but with the objects appearing larger. The magnification of the telescope could be the result of a combination of the focal length of the telescope itself, and focal length of the telescope eyepiece. A telescope of a specific focal length will generate an image of a specific size, which is fixed and won't vary. The eyepiece, successfully employed as a microscope, then views that image. A bigger image to begin with permits the eyepiece to generate a higher magnification. So, by changing the eyepiece, the magnification of the telescope may also be changed. Stargazing is one of the most fascinating hobbies and excellent items like the Prism Waterproof Binocular on this page will make the expertise even more magical.