Canon'un resmi olmasa da toz ve suya dayanıklı lensleri:

EF 14mm f/2.8L II
EF 16-35mm f/2.8L
EF 16-35mm f/2.8L II USM
EF 17-40mm f/4L
EF 24-70mm f/2.8L
EF 24-105mm f/4L IS USM
EF 70-200mm f/2.8L IS
EF 70-200mm f/4L IS
EF200mm f/2L IS USM
EF 300mm f/2.8L IS
EF 400mm f/2.8L IS
EF 500mm f/4L IS
EF 600mm f/4L IS
EF 800mm f/5.6L IS USM
EF 50mm 1.2L USM
85mm 1.2L II USM

Şu lensler de kullanıcılara göre dayanıklı değiller:

EF 70-200mm f/2.8L
EF 70-200mm f/4L
EF 28-300mm f/3.5-5.6L IS
EF 100-400mm f/4.5-5.6L IS
EF 14mm f/2.8L
EF 24mm f/1.4L
EF 35mm f/1.4L
EF 85mm f/1.2L
EF 100mm Macro f/2.8
EF 135mm f/2L
EF 200mm f/2.8L
EF 300mm f/4L IS
EF 400mm f/5.6L
EF 180mm f/3.5L Macro
TS-E 24mm f/3.5L

Şunlar da Canon tarafından onaylı resmi bilgiye dayaranak dayanıklı lensler:

EF 16-35mm f/2.8L USM
EF 24-70mm f/2.8L USM
EF 28-300mm f/3.5-5.6L IS USM
EF 70-200mm f/2.8L IS USM
EF 300mm f/2.8L IS USM
EF 400mm f/2.8L IS USM
EF 400mm f/4 DO IS USM
EF 500mm f/4L IS USM
EF 600mm f/4L IS USM
Extender EF 1.4x II
Extender EF 2x II
EF 16-35mm f/2.8L II USM

Burada da açıklaması mevcut :
http://www.usa.canon.com/consumer/co...DtlAct&id=2651