Telescopes have refraction type, reflex and fold reflected type 3 kinds:
1. The refraction type use rise more convenient, the vision is bigger, star like bright, but have off color, which reduces the resolution. The high quality of the mirror reflects the objective is two pieces of double color separation away three of the objective or complex away off color optical lens. But, back off color or after away off color and can't completely eliminate off color. Refraction type light way
2. The advantages of the mirror is not off color, but, mirror the coma of poor and like taking bigger, makes the edge like poor vision qualitative change. Commonly used mirror have Newton type and card plug green type two kinds. The former optical system is simple, cheap, spherical reflector in the end, the eyepiece in front side; The latter of the optical system in the Lord, deputy mirror for the sphere, the primary mirror and eyepiece are in the back, the image quality is good, price is more expensive. Reflex the light way
3. Fold the mirror reflects both the lens and a mirror advantages: big, like good quality view, a cylindrical tube short, easy to carry. Focal length and the same caliber and etc of refraction of telescopes, the price is less than a third. Fold the mirror have schmidt-card plug green type and mark Sue's husband-card plug green type two kinds, the latter says horse-card mirrors. Horse-there are two chip and mirror card three chip two kinds. For example: bo champions league BOSMA1800150 and BOSMA2400200 are three chip, for the image than two chip better, double the domestic and foreign observers welcome. Fold trans light way

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