This question has been asked to me so many times that I decided to make an ‘official’ list that I can refer people to the next time the question pops up in a forum.

Before going to the list, you have to know that the weather sealing of the Canon 5DMrkII is marginal. Unfortunately, it is not as good as the pro series, Nikon or Pentax. Still, it is better than nothing and if you are careful it should be enough for most situation. The first time I had to trust it, I was a bit scared but now I am not afraid to pull my camera out in light rain.

Lenses in italic are rumored to have some level of weather protection but this protection is not endorsed by Canon. So trust at your own risk!

• Canon EF 16-35mm/2.8L USM
• Canon EF 16-35mm/2.8L II USM
• Canon EF 17-40mm/4L USM
• Canon EF 24-70mm/2.8L USM
• Canon EF 24-105mm/4L IS USM
• Canon EF 70-200mm/4L IS USM
• Canon EF 70-200mm/2.8L IS USM
• Canon EF 28-300mm/3.5-5.6L IS USM
• Canon EF 50mm 1.2L USM
• Canon EF 85mm 1.2L II USM
• Canon EF 200mm f/2L IS USM
• Canon EF 300mm/2.8L IS USM
• Canon EF 400mm/2.8L IS USM
• Canon EF 400mm/4DO IS USM
• Canon EF 500mm/4L IS USM
• Canon EF 600mm/4L IS USM
• Canon EF 800mm/5.6L IS USM