How to select a Scope II.

7. Main materials of endoscope:

The model will be made of aluminum magnesium alloy oscilloscope body, strong and light, but of course expensive. There are also models made of composite materials. We generally believe in the durability of metal, after all, it has stood the test of time. Ordinary fuselage using aluminum alloy, cheap and reliable. For the sake of price, you don't have to worry about the weight being a little heavier than the aluminum magnesium alloy. There are also a lot of mirror body is made of plastic, or with thin iron sheet roll, the price is cheaper, but the life is short, so it is not recommended to buy

Eight of them. Nitrogen-filled waterproof:

This is a very popular technology. It pumps dry, clean nitrogen gas into the telescope's sealed chamber to prevent fogging, mildew, and the invasion of dust and moisture inside the telescope. Can adapt to the changing climate of the field environment. Greatly increase the service life of the telescope. Some high-end models are now using argon gas, which has high molecular weight, low loss and high stability, to inflate the interior of the telescope. Of course, it's going to cost more than nitrogen.

9. Center of Gravity position:

For a good telescope, the center of gravity is best where the quick-release plate is connected, so it is easy to change the direction of the scope. Sometimes the appearance design must follow the optical design, resulting in the center of gravity deviation, so the use of center of gravity sliders and other small accessories to correct the center of gravity position.

10. Focus:

An in-focus scope is recommended because a telescope with this structure focuses with the objective and eyepiece fixed and only one negative lens moving inside the telescope. The advantage of this structure is that higher air tightness can be achieved. In addition, the sense of focus is very important. Too loose damping can easily slip through the count, and too tight damping can tire your fingers. Tightening and loosening the damping can drive you crazy, like sitting on a seesaw and not finding your balance point. High-end single-tube point sources will have two focusing wheels, one for coarse tuning and one for fine tuning, so that focus can be both speed and precision. The positioning of the focus wheel is also very special. In general, the right hand is more flexible, so it is best to choose a monocular with the focus wheel on the right.

11.45 degree sight vs. Straight Sight:

A 45-degree scope is generally recommended because it is the most comfortable for viewing. If you have a straight scope, you will have to extend the tripod higher to get to the eyes, which will reduce the stability of the tripod. However, a straight-line scope is better suited to photographing birds with a small digital camera because the line of sight is aligned with the direction of the telescope.

12. Tripods and window brackets:

Tripods and window brackets are a problem that many novices tend to overlook. Most people are usually reluctant to spend money on tripods and gimbales. A light and reliable tripod is very important. Light weight can reduce the burden of wilderness trekking, and firmness can improve the stability of high magnification observation. If the economy allows, a carbon fiber tripod is a good choice. Some inexpensive domestic aluminum tripods also performed well. It is recommended to choose a window mounting bracket controlled by a single handle, which is easiest to operate.