Two years ago I purchased the Ikelite DLM Underwater Housing for the Canon R7 and couldn't be happier with my decision. The lenses I'm using with the Canon R7 and Ikelite DLM underwater housing is the Canon EF 100mm macro lens, Canon EF 8-15mm fisheye, Tokina 10-17mm fisheye, Canon EF 60mm macro, Sigma 10-18mm, and Sigma 4.5mm lenses with their respective dome or flat ports.
The following images are shot from a recent trip to Madeira, Portugal, the Canary Islands, and Egypt.

Canon R7 + Canon RF 15-30mm lens at 15mm • f/16 • 1/160 • ISO 160 © Patrick Dold

Canon R7 + Tokina 10-17mm at 14mm • f/7.1 • 1/250 • ISO 400 © Patrick Dold

Canon R7 + Canon EF 100mm lens • f/14 • 1/250 • ISO 250 © Patrick Dold

Canon R7 + Sigma 10-18mm at 13mm • f/7.1 • 1/160 • ISO 320 © Patrick Dold

Canon R7 + Canon EFs 60mm • f/16 • 1/320 • ISO 160 © Patrick Dold

Canon R7 + Canon EF 100mm • f/11 • 1/250 • ISO 125 © Patrick Dold

Canon R7 + Canon RF 15-30mm at 15mm • f/13 • 1/200 • ISO 160 © Patrick Dold

Canon R7 + Sigma 10-18mm at 11mm • f/7.1 • 1/100 • ISO 320 © Patrick Dold

Canon R7 + Sigma 10-18mm at 14mm • f/7.1 • 1/160 • ISO 250 © Patrick Dold

Canon R7 + Canon 15-30mm at 30mm • f/16 • 1/10 • ISO 100 © Patrick Dold
Earlier this year I returned from my first trip to Madeira, Portugal and before that trip I asked myself if I could get circular fisheye images with my APS-C Canon R7. For full frame underwater shooters it's quite easy to use the Canon EF 8-15mm lens for circular fisheye shots on the 8mm end but with APS-C it's a little different. I found a used Sigma 4.5mm lens with the EF to RF adapter mount and with the Ikelite DLM 6 inch Dome Port with Zoom Extended .375 Inch # 5516.16 it's a perfect combo.

Canon R7 + Sigma 4.5mm • f/7.1 • 1/100 • ISO 500 © Patrick Dold

Canon R7 + Sigma 4.5mm • f/3.6 • 1/100 • ISO 160 © Patrick Dold

Patrick Dold is an underwater photographer who has also developed a passion for topside nature and wildlife photography as well. He shoots with the Canon R7 and a variety of lenses from the Canon 100mm macro to the Sigma 4.5mm fisheye and enjoys trying an array of styles and techniques to give his photography portfolio some variety. You can see more of Patrick's work on his Instagram @patrick_dold_photography.
Additional Viewing
More Power, Smaller Package: Moving to Mirrorless with the Canon R7
Bryant Turffs' Set-Up Tips // Ikelite Underwater Housing for Canon R7 [VIDEO]
Rectilinear vs Fisheye Lenses for Underwater Wide Angle Photography [VIDEO]
GET the Canon 8-15mm Fisheye Before It's GONE! // Underwater Review & Results
Canon RF 100mm F2.8L Macro and Canon R7 Underwater Micro-Review & Results