Hise,
Bino tu beli dari mana? Petaling Street? Yang saya tau kalau bino tu stated magnification X aperture yang bukan bukan, kemungkinan besar bino tu dari China ataupun Russia. You tahulah, yang murah murah tu....
Sebab bino yang berkualiti sederhana ataupun tinggi, ia akan menyatakan 7x50,8x42,20x100 dan lain-lain lagi.
Sebelum memilih bino yang sesuai untuk awak, awak mestilah faham What is your purpose, how wide or narrow field and the magnification of a bino do you need?
If you like a wider field of view that can see a lot of stars across the field of view, then choose 7x50.....etc bino.
If you like narrow field of view and can magnify the objects closer, then choose 10x50,20x100.....etc bino.
If you like lightweight bino that can hold in on your hand for the whole night long, the choose 7x50,8x42....etc bino
If you prefer a heavyweight bino that need to install on the tripod, then choose 20x100...etc bino.
What other things that you need to understand is for an example when choosing a right bino,
1. What is the first number in the binocular title?
The first number in a binocular name indicates the magnification power – for example, the 7x42 Montana has a 7x magnification. Power represents how many times closer an object appears when viewed through the binocular. For example, a 10x magnification means an object appears ten times closer than when viewed by the unaided eye. Zoom binoculars provide a variety of magnifications (7x - 10x for example) to the user, allowing the option for lower and higher-powered viewing in a standard package.
2. What is the second number in the binocular title?
The second number in the binocular title refers to the size of the objective, or front, lens of a binocular in millimeters. A larger objective lens gathers more light and will produce a crisper, brighter image.
3. What are coatings? What are the different types?
Like telescopes, binocular lenses are coated with invisible coverings that work to improve the amount of light transmitted from the front lens to the eyepiece. Coatings are necessary because incoming light is reflected and lost as it passes through a binocular’s lenses, sometimes up to 50 percent. While high quality lenses greatly reduce the level of light loss, binoculars need additional chemical coatings to reach a desirable level of visual clarity. There are four coating levels with fully multi-coated being the highest classification and quality.
* Coated optics (C) – one or more glass surfaces are coated.
* Fully Coated (FC) – All air-to-glass surfaces within the binocular are coated.
* Multi-Coated (MC) – have one or more surfaces of one of more lenses coated with multiple films. Some surfaces could have a single coat or some no coating at all.
* Fully Multi-Coated (FMC) – have multiple coating films on all air-to-glass surfaces.
4. Why do binoculars have prisms? What are the differences between a porro and roof prism?
Binocular prism glass works inside the binocular to flip the image upright for viewing. The two most common prism designs are porro and roof prisms. Porro prisms work in a simple zig-zag fashion to flip the image and account for the classic binocular shape. Conversely, roof prisms flip the image in a straight line, making the objective lens and eyepiece line up in a more compact design. Two varieties of prism glass are also available, BK-7 and BAK-4. BAK-4 is the higher quality and denser glass that produces brighter and sharper images.
Regards,
Tommy
