We take a minute to answer the question, is the Canon 100-400 II weather sealed. It's a solidly built, capable Canon "L" lens with great image quality, but is it a good outdoor lens that will handle the elements of the weather and the environment.
After the post on what kinds of photography the Canon EF 100-400 II lens is good for was published, the question about weather sealing on this lens keeps coming up. The quick answer is yes.
The easiest evidence of weather resistant seals on a lens can be found by looking at the lens mount closely. You'll see a rubber ring between the internal flange and the first section of external lens barrel.
It's not a bad idea to keep that rubber ring, often referred to as the "dust donut, free of dust and debris, particularly if you do frequent lens changes like I do.
No, waterproof means that you could submerge your lens underwater or hold it under a waterfall without any ill effects. "Weather sealed" and weather resistant don't mean waterproof. If you need to be wearing rain gear yourself, it's likely that your lens will need additional protection too, other than just the weather seals.
The weather resistant protection measures that are built into your Canon 100-400 lens are significant and it could survive a few splashes. Your lens is not going to go remain undamaged if it's subjected to high pressure water.
Canon uses some type of sealing at all the locations on a lens where water and dust intrusion could happen. This includes both the zoom and focusing ring, the lens barrel and the switches.
Weather sealed lenses use either rubber or silicon, or combination of both that is inserted between the moving surfaces on the exposed lens barrel to seal as much moisture, dust, grit, and any other foreign matter out of the inside of the lens.
Weather sealing is particularly more important with zoom lenses, like the Canon 100-400 IS II, because they have more potential entry points for contaminants than prime lenses, like the 85mm f/1.8 or any of the 50mm lenses.
It's best to use your camera in a way that subjects it to as little exposure to the elements as possible. That could be accomplished in several ways. Sometimes you just do whatever works at the time to protect your Canon lens and camera.
Whether you carry an umbrella, use a specially designed camera raincoat, or improvise with a plastic trash bag, there's no need to get fancy with it.
If your Canon 100-400 IS II does get some surface moisture, wipe it off gently with a soft, clean towel BEFORE you remove your lens from your camera body. And of course, always protect the front element of your lens with a protective lens filter. Keep it clean to maintain the best sharpness in your photos.
Have a blast....shoot a Canon.
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