A special zoom sleeve for use with the Canon 18-55mm STM lens when used with the Canon EOS 100D Rebel SL1 in Ikelite Compact DSLR Housing.
The full zoom range of the lens is accommodated by the housing's standard dome port without vignetting (dark shadows in the corners of the image). This sleeve is also compatible with the Tokina 10-17mm lens. You will experience some vignetting when using this lens in the 10-12mm focal range.
To use the Canon 18-55mm STM lens with any other model of Ikelite DSLR housings, this zoom sleeve is not necessary.