When it comes to buying a telescope, one of the most important factors to consider is the magnification. But how do you know what magnification is generally good for a telescope? 

First, it's important to understand what magnification actually means. Magnification is the amount by which an object is enlarged when viewed through a telescope. To determine the magnification, you simply divide the focal length of the telescope by the focal length of the eyepiece. 

So, what is a good magnification for a telescope? Well, the answer depends on a few factors. 

One factor is the aperture of the telescope. The aperture is the diameter of the main mirror or lens that collects light and forms the image. A larger aperture allows more light to enter the telescope and provides better image quality, meaning you can use higher magnifications. For example, a telescope with an aperture of 8 inches can typically handle magnifications up to 400x, while a telescope with a 3-inch aperture may only be able to handle magnifications up to 150x. 

Another factor to consider is the atmospheric conditions. On nights when the atmosphere is stable and the air is still, you can use higher magnifications without the image appearing blurry. On nights when the atmosphere is turbulent, however, you may need to use lower magnifications. 

Finally, it's important to consider the object you want to observe. Some objects, such as the moon and planets, can handle higher magnifications, while other objects, such as galaxies and nebulae, require lower magnifications to see the entire object. 

In general, a good magnification range for a telescope is 50x to 250x, depending on the factors mentioned above. It's important to remember that higher magnifications don't always equal better views, and that a good quality telescope with a lower magnification can still provide stunning views of the night sky. 

In conclusion, understanding what magnification is and what factors to consider will help you determine what is a good magnification range for a telescope. Keep these factors in mind when shopping for a telescope, and you'll be well on your way to obtaining a high-quality instrument that will provide years of enjoyment.