Tele-Extender EF 2xIITele-Extender EF 1.4II

EF 2xII是新设计的。

EF 2x II Tele-Extenders Specifications:
Extender Construction: 7 elements in 5 groups (entirely new optical design)
Lens Coating: Super Spectra multi-coating
Depth-of-field: Approximately 0.5x that of the master lens
Dimensions(Diameter x Length): 2.8 x 2.3 in./ 71.8 x 57.9mm
Weight: 9.3 oz./265g
Front Cap: Extender Cap E II (same as previous EF tele-extenders)
Rear Cap: Lens Dust Cap E (standard EF rear lens cap)
Lens Case: Soft Case LP811

EF 1.4XII是原来的光学结构：

EF 1.4x II Tele-Extenders Specifications:
Extender Construction: 5 elements, in 4 groups (same as previous EF I.4x)
Lens Coating: Super Spectra multi-coating
Depth-of-field: Approximately 0.7x that of the master
Dimensions(Diameter x Length): 2.9 x 1.1 in./ 72.8 x 27.2mm
Weight: 7.8 oz./220g
Front Cap: Extender Cap E II (same as previous EF tele-extenders)
Rear Cap: Lens Dust Cap E (standard EF rear lens cap)
Lens Case: Soft Case LP811

的确是改进了防水性能，可以与1V匹配了。

另外，从图上看，2x好像能加上一个三角架接环，不知道是那个型号的？

从eos list的消息来看，好像没什么大的改进，主要是内部植绒更好，能更好地抑制眩光，但是价格贵了好多

还有，不是IS的