Q1: How far can the telescope see?
The telescope can see as far as the naked eye can see, but the telescope can bring things closer and see more details. The object is zoomed in to 100 meters to see.
Q2: What is the size of the telescope?
For simplicity, telescopes are classified into a compact, medium, and full-size types based on the diameter of their objective lens. But please note that the differences in optics, design and structure still mean that models with the same size objective lens will differ in size and weight.
Compact: the objective lens diameter is less than 30mm (8x25, 10x28, etc.)
Medium size: objective lens diameter from 30mm to 40mm (8x30, 8x32, etc.)
Full size: the diameter of the objective lens is greater than 40mm (8x42, 10x56, etc.)
Q3: What do the parameters (specifications) on the telescope mean?
The numbers on the telescopes represent their magnification (magnification) and size (objective lens diameter). For example, in a 10x42 telescope, "10" is the magnification and "42" is the diameter (in millimeters) of the objective lens (the lens closest to the object being observed). The objective lens size allows you to understand the physical size of the telescope and the amount of light incident. When you understand the meaning of these numbers and how they affect your viewing, you will know whether the telescope you choose is suitable for bird watching, race watching, outdoor activities, travel, or use on a moving boat.
gain
In most cases, it is recommended to choose between a fixed magnification of 8x or 10x, but you can also find models with lower or higher magnifications. Although it seems that the greater the magnification, the better, but this is not always the case. Because the magnification also magnifies the movement of your hand, binoculars with a magnification greater than 10 are difficult to watch stably, so if you are on a boat or other mobile platform, they will be a poor choice.
8 times telescope: wider field of view, suitable for large-scale observation, more stable handheld
10 times telescope: a stronger sense of zooming in, suitable for detailed observation
*About zoom telescope: Although this sounds like a good solution, there is a trade-off in terms of image quality. If you are considering buying a pair of zoom telescopes, please compare them with some fixed-magnification telescopes before making your final choice.
Objective lens diameter
The diameter of the objective lens plays a key role in how much light the telescope can collect. For two pairs of telescopes with exactly the same specifications, a telescope with a larger objective lens will capture more light, thereby providing a brighter image. (Binoculars with higher quality optics will also have brighter images.)
Field of View (FOV)
The field of view represents the maximum range that the telescope can usually observe at 1000 meters (the width of the horizon), which is generally expressed by the horizon (observable width) of kilometers and converted into an angle (angle of view). The larger the field of view, The larger the observation range. Generally speaking, the larger the aperture and the lower the magnification, the larger the field of view, but even telescopes with the same parameters have different fields of view due to different structural designs.
The wide field of view helps when you need to observe or scan a large area to find something, for example, when you spot a bird on the tree canopy and quickly put the binoculars on your eyes, it is also very useful of. The wider the (wide) field of view, the easier it is to find the target. When observing fast-moving targets, a wide field of view is also very important, and it is not easy to miss opportunities. If it is sailing, it will help avoid the risk of collisions and rocks.
