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With the 2.2" Mirrorless Lens Port Extension from Ikelite, you can increase the length of a Mirrorless Flat Port for use with longer lenses. Combine this accessory with the Mirrorless Flat Port Extended, and you'll be able to use the Canon EF 100mm f/2.8L Macro IS USM lens with the Ikelite Housing for the Canon EOS Rebel SL1 DSLR. This extension enables the use of auto focus but not manual focus. See below for a list of compatible lenses and on the Port Chart.
No tools are needed to remove an existing port and attach the Lens Extension to your housing. Simply take off the port and slide the extension over the port base in its place. Then, slide the port over the extension.
Use with Mirrorless Flat Port Extended to accommodate the following Canon lenses:
EF-S 18-55mm f/3.5-5.6 IS STM, with/without Canon Extension Tube EF 12 II, EF 25 II, or both EF 12 II and EF 25 II together
Must use both extension tubes together to have access to zoom control with 18-55mm lens
EF-S 60mm f/2.8 Macro USM, with/without Canon Extension Tube EF 12 II, EF 25 II, or both EF 12 II and EF 25 II together
EF 100mm f/2.8L Macro IS USM, with/without Canon Extension Tube EF 12 II