This Sea & Sea zoom gear is used when the Canon 18-55mm zoom lens is in the compact wide port (56280) along with the NX compact macro port base (50201).
Please note: When the gear is mounted on the following lenses in accordance with the original (previous) instruction manual, it may not function properly, as the lens gear and the gear inside the housings may not mesh properly:
Canon EF-S 18-55mm F3.5-5.6 USM
Canon EF-S 18-55mm F3.5-5.6 ll USM
Canon EF-S 18-55mm F3.5-5.6 IS
Canon EF-S 18-55mm IS ll
When the gear is mounted in accordance with the revised instruction sheet, it will function without any problem.