放大镜头通常被分为三种价格类型。我喜欢把它们分为 :业余镜头（非常便宜）、普通“专业”镜头（价格适中）和复消色差（ＡＰＯ）镜头（非常昂贵）。在购买廉价的小型放大机时 ,业余镜头通常已装在了放大机上。这种廉价放大机常无法换用其他焦距的镜头。专业镜头通常是与放大 Magnifying lenses are usually divided into three price types. I like to classify them as: amateur lenses (very cheap), normal “professional” lenses (affordable) and apochromatic (APO) lenses (very expensive). Amateur lenses are often installed on the magnifier when you buy a cheap, small magnifier. This cheap magnifier often can not switch to other focal length lens. Professional lenses are usually with magnification