The best you can get, the new Canon EF 100-400 mm f/4.5-5.6L IS II USM
Powerful telephoto performance, wherever you are. This compact, high-performance 100-400mm zoom lens is ideal for those shooting sports, action and wildlife photography. A 4-stop Image Stabilizer and high-quality optics deliver superb sharpness. The EF 100-400mm f/4.5-5.6L IS II USM is ideal for photographers who are travelling light and want to take just one telephoto lens with them. A great choice for sports and wildlife photography, the 100-400mm zoom range puts you right next to distant subjects, and lets you react quickly in a fast-changing situation.
The EF 100-400mm f/4.5-5.6L IS II USM delivers sharp, high-contrast images, using Fluorite and Super Ultra-low Dispersion (Super UD) lens elements to tackle artefacts and distortion.
The Samyang pro 14mm 1: 2.8 ED AS IF UMC is the only third-party lens in my camera bag, I use on my Canon cameras. The low-cost, high-intensity ultra wide-angle lens delivers amazingly sharp pictures on full frame and the 7D2.
Specially I use it for Astro, Landscape and interior shots and for RAW Video.
Especially the low Croma makes the Lens for me to one of the best Lens for Astro Photography and Timelapse Astro Time lapse recording
The Canon Extender EF 1, 4 x III teleconverter with 1,4-facher focal length multiplier for me is constantly in use.
For Bird photography the 1,4x Extender is generally connected on my EF 600mm f4 L IS USM Lens to extend the focal Length from 600mm to 840 mm and also on the new Super Tele zoom EF 100-400mm f4,5-5,6 L IS USM II to extend the focal length from 100-400 160-560 mm focal length.
The Canon Extender EF 1, 4 x III Converter can be used also an a lot other Canon Lenses and is compatible to all my Canon DSLR Cameras. The new Canon Extender Generation III are built without noticeable loss of quality and minimal influence on the AF speed.