Ikelite dome port 5510.45/5510.24 is an 8 inch acrylic dome, used with wide-angle lenses for underwater photography. also includes 5509.28 zoom kit

Please watch video for HOW TO USE
https://www.youtube.com/watch?v=Y6MSAKIHOVk
https://www.youtube.com/watch?v=tZR1hKe-N5Y

see following chart to see compatible lenses for Canon/ Sigma/ Tamron and others
http://www.ikelite.com/images/products/housings/general/fl-port-charts.pdf

*******Canon Lens Chart see below

Canon 16-35 mm USM
• Zoom with 5509.28 zoom set - included with housing
• Adding a +2 close-up lens not required but may improve corner sharpness

Canon 17-40 mm f/4L EF USM
• Zoom with 5509.28 zoom set - included with housing

Canon 24-70 mm f/4L IS USM
• Zoom with 5509.21 zoom set - sold separately
• Use fixed Flat Port for macro - lens macro switch is not accessible in this installation
• Use 8-inch Dome Port for wide angle and portrait

Canon 28-105 mm 1:3.5-4.5 EF USM II
• Zoom with 5509.28 zoom set - included with housing
• Addition of a +4 close-up lens is required for this lens to focus underwater
• Addition of a +4 close-up lens is required for this lens to focus underwater
• Select a flat port for sharper image quality, but reduced angle of coverage

Canon 35-135 mm
• Addition of a +4 close-up lens is required for this lens to focus underwater

Canon 50 mm f/1.2L USM
underwater
• Addition of a +4 close-up lens is required for this lens to focus underwater behind a dome
• Select a flat port for sharper image quality, but reduced angle of coverage
• Flat port recommended

Canon 50 mm f/2.5 Compact Macro

Canon 100 mm Macro

Canon 100 mm f/2.8 EF Macro
• Auto or manual focus
• Cannot switch between manual and auto focus underwater

Canon 100 mm f/2.8 EF USM Macro (non-IS)
• Auto or manual focus depending on choice of port

Canon 100 mm f/2.8L EF IS USM Macro
• Auto or manual focus depending on choice of port