可选规格：
20mm - (50mm > 70mm)
30mm - (120mm > 200mm)
45mm - (120mm > 200mm)
45mm -(200mm > 350mm)
50mm - (120mm > 200mm)
50mm -(200mm > 350mm)
55mm - (60mm > 80mm)
65mm - (120mm > 200mm)
65mm - (200mm > 350mm)
80mm - (550mm > 1000mm)
105mm - (200mm > 350mm)