The "ultimate" wide angle lens? It's lightweight, has IS, and captures an incredible field of view!
Canon 70-200mm f/4L IS II
A staple for any photographer! The versatility is endless and it's a nice, lightweight option for day hikers.
Canon 85mm f/1.8
This is a perfect, lightweight, sharp, and inexpensive prime that really delivers amazing results. It's not an L, but it's a perfect option for portraits of all kinds.
Canon 50mm f/1.8
A great first lens beyond the kit lens provided with most cameras. It is inexpensive, sharp, and offers good portraits in a tiny package!
Canon EF-S 10-18mm f/4.5 IS
A lightweight wide angle lens for crop sensor cameras that delivers a much wider field of view. The IS helps deliver great landscape shots!
Sigma 18-35mm f/1.8 Art
The only lens I used on a crop sensor that rivaled the image quality of an L zoom.
Canon 24-70mm f/2.8L II
The standard workhorse. If I could only keep one... When I head out the door and don't know what to expect, 9 times out of 10 this is what I put on before leaving.
Canon 135mm f/2L
The ultimate portrait machine. If the headshot is critical, this is the one to do it.
Sigma 35mm f/1.4 Art
An ultra sharp, ultra low light option. The perfect "environmental portrait" lens.
Canon 70-200mm f/2.8L IS
Is it the ultimate sharp, low light zoom? It can be used for sports, portraits, landscape, etc. The IS makes it extremely versatile, but what if there is a downside?
Canon EF-S 17-55mm f/2.8 IS
This is probably the best standard zoom lens for crop sensor Canon cameras. The IS and f/2.8 make this useful in all situations.
Moment Smartphone Lenses
If I don't have my DSLR with me, this wide angle smartphone lens is a perfect fill in!