Yunnan Zhongyang photoelectric instrument Co., LTD
Learing center details
The resolution of the telescope is generally angular resolution, in seconds, which refers to the apparent resolution Angle of the telescope, that is, the Angle formed by the two points that can just be distinguished and the naked eye.
The smaller the resolution number, the smaller the distance between the two points that can be resolved, the stronger the resolution of the telescope, so, contrary to the value, the higher the resolution of the telescope the smaller the value.
In other words, the smaller the resolution number of the telescope, the higher the resolution, be careful not to confuse, that is:
Better resolution for ≤7" telescopes and ≤10" telescopes, ≤7" telescopes.
Resolution is a physical index, calculated by the formula:
Resolution =140/ objective diameter
The formula calculated is the theoretical resolution, the actual resolution of the telescope is also affected by a number of factors such as component grade, optical design, use environment, generally lower than the theoretical resolution.
So in optical design, the actual resolution is actually calculated by multiplying the theoretical resolution by a safety factor:
Resolution =1.2x140/ objective diameter
perhaps
Resolution =2x120/ objective diameter
Where 1.2 and 2 are the safety coefficient, the value is an empirical constant, and the value is different for different levels of products or manufacturers.
Under laboratory conditions, the actual resolution can be relatively accurate through the measurement of special instruments, but this value does not take into account the environmental factors used, so in addition to the actual resolution measured by the laboratory in the high-end products of individual manufacturers, most popular telescopes generally do not mark the resolution index, or only mark the theoretical resolution.
The resolution of a telescope is generally no more than 20", while the resolution of the naked eye is about 60", so objects can be seen through a telescope that cannot be clearly seen by the naked eye.
Special note:
Yuanwang net value method is, for the manufacturer marked the specific parameters of the product, according to the manufacturer index mark, not marked, Yuanwang value is the most safe factor 2, so that although the resolution of the mark is low, but the product resolution is actually higher than the theoretical value of similar products.
