Weather sealing marketing implies a level of durability that doesn't always match how these systems actually hold up under genuinely demanding real-world use, and after years of shooting outdoor events in every kind of weather, I've got a more realistic read on what it actually protects against versus what still requires real caution.
Light rain and dust: genuinely well protected
For the kind of weather most weather-sealed bodies are actually tested against, drizzle, dusty outdoor conditions, brief exposure, current sealing genuinely works as advertised, and I've shot through conditions that would have worried me years ago without a second thought on a properly sealed body and lens combination. This is the case weather sealing is actually built for, and it delivers reliably there.
Sustained heavy rain and submersion: still a real risk despite the rating
Weather sealing is not the same as waterproofing, and sustained heavy rain, especially combined with the pressure of water actively being driven into seams by wind, pushes past what most sealed systems are genuinely built to handle indefinitely. I still use a rain cover for anything beyond genuinely light, brief rain exposure, regardless of how confident the manufacturer's marketing sounds, because I've seen sealed gear fail in conditions the marketing implied it should have handled fine.
- Light rain, dust, brief exposure: modern sealing genuinely delivers
- Sustained heavy rain, wind-driven water: still use a real rain cover
- Lens mount seals degrade over time and need periodic checking, not just trust
The maintenance angle that's easy to forget
Weather sealing isn't a permanent, unchanging property of a body, seals degrade with age and use, and a five-year-old body's sealing shouldn't be trusted at the same level as a brand new one straight from the factory, even though the spec sheet claim hasn't changed. I've started treating weather sealing as something that needs periodic real-world confidence checking on older gear rather than an assumed constant, which has changed how cautiously I treat my own aging bodies in genuinely wet conditions.