Applicable lens:

Small (S): thickness 0.3cm can be loaded with a total length of no more than 8cm, the diameter of the lens is not more than 8cm 

Medium (M): thickness 0.3cm can be loaded with a total length of no more than 12cm, the diameter of the lens is not more than 10cm 

Large (L): The thickness of 0.3cm can be loaded with a total length of no more than 16cm, and the diameter of the lens is not more than 10cm

eXtra Large (XL): 0.3cm thick. It can loaded a lens with a total length of no more than 20cm and a diameter of not more than 10cm.