Best Humidity For Camera Lenses & How To Protect Camera From Humidity

Moisture is a formidable foe of photography and sensitive equipment storage. The delicate balance of maintaining optimal humidity levels is paramount, not just for the preservation of the equipment but also for its performance. 

What is the best humidity for camera lenses?

The best humidity level for storing camera lenses and other photographic equipment is typically between 40% and 50% relative humidity (RH). This range ensures that the environment is not too dry, which could harm the lubricants and rubber components, and not too humid, which could promote fungal growth and corrosion. 

Maintaining your equipment within this humidity range helps in preserving its longevity and performance.

Related Content: Camera Lens Buying Guide For Beginners

Wet Fujifilm Lens

Importance of Controlling Humidity for Camera Equipment

Humidity, or the amount of water vapor present in the air, can have significant effects on various objects, including electronic devices and precision instruments. 

Camera equipment, which often consists of intricate electronic and mechanical components, is particularly susceptible to damage from excessive humidity. 

While cameras are built to withstand various conditions, prolonged exposure to high humidity can be detrimental. Photographers, whether amateurs or professionals, must understand the importance of controlling humidity and take proactive measures to protect their valuable equipment. 

Investing in solutions like dry cabinets or dehumidifying tools can go a long way in preserving the integrity and performance of camera gear.

Here’s why controlling humidity is necessary for maintaining the longevity and functionality of your camera gear.

Prevention of Fungal Growth

One of the primary concerns with camera lenses is the growth of fungus. High humidity levels provide an ideal environment for fungal spores to thrive. Once these spores settle on lens elements, they can grow and spread, leading to permanent damage that can degrade image quality.

Related Content: How To Clean The Lens of a Camera

Protection of Electronic Components

Modern cameras are packed with electronic circuits and sensors. Excessive moisture can lead to short circuits, corrosion of metal parts, and malfunction of the electronic components. This not only affects the camera’s performance but can also lead to costly repairs.

Preservation of Mechanical Parts

Camera bodies and lenses have numerous mechanical parts, such as focus and zoom rings, shutters, and aperture blades. Humidity can cause these parts to swell, rust, or become sticky, hindering their smooth operation.

Avoidance of Condensation

Rapid changes in temperature can cause condensation to form on or inside the camera and lens. This is especially common when moving from a cold environment to a warm, humid one. Condensation can fog up the lens, making it impossible to shoot, and in worst-case scenarios, water droplets can damage internal components.

Learn how to prevent condensation.

Maintaining Image Quality

Humidity-related issues, such as fungal growth or condensation, can directly impact the image quality. Fungus can create soft spots or blemishes in photos, while internal condensation can lead to foggy and unclear images.

Extending Equipment Lifespan

By controlling humidity and ensuring that your camera equipment is stored in optimal conditions, you can significantly extend its lifespan. This not only saves money in the long run but also ensures that your gear performs at its best for longer periods.

Protecting Investment

High-quality camera equipment is an investment. By taking steps to control humidity, photographers can protect their investment, ensuring that their gear remains in top condition and retains its value over time.

ThermPro Hygrometer

How To Protect Your Camera From Humidity

Here are some effective steps to safeguard your camera equipment from the adverse effects of humidity. 

By following these precautions, you can significantly reduce the risk of humidity-related damage to your camera equipment and ensure that it remains in top condition for years to come.

  • Use a Dry Box or Dry Cabinet: These are specially designed storage solutions that maintain a consistent low humidity level, ideal for storing camera equipment. They often come with adjustable humidity settings and a hygrometer to monitor the internal humidity level.
  • Silica Gel Packs: These are small packets filled with desiccant material that absorbs moisture. Place them in your camera bag or storage box to help reduce humidity. Remember to replace or recharge them once they become saturated.
  • Airtight Containers: Store your camera and lenses in airtight containers with some desiccant packets. This will prevent external humid air from entering the container.
  • Regular Use: Regularly using your camera can prevent fungal growth. When a camera is frequently exposed to fresh air and sunlight, it reduces the chances of fungus settling on the lens or other parts.
  • Avoid Sudden Temperature Changes: Moving your camera from a cold environment to a warm, humid one can cause condensation. If you anticipate such a change, keep your camera in its bag for a while to allow it to acclimatize gradually.
  • Wipe Down Your Equipment: After using your camera, especially in humid or wet conditions, wipe it down with a soft, dry cloth to remove any moisture.
  • Avoid Storing in Basements or Attics: These areas tend to have higher humidity levels. Instead, store your camera in a cool, dry place.
  • Use a Dehumidifier: If you’re storing your camera equipment in a room, consider using a dehumidifier to reduce the overall humidity level.
  • Regular Maintenance: Periodically check your equipment for signs of fungus or moisture damage. If you spot any, address it immediately.
  • Weather-Sealed Gear: If you frequently shoot in humid or rainy environments, consider investing in weather-sealed cameras and lenses. They offer better protection against moisture.
  • UV Exposure: Occasionally exposing your camera and lenses to UV light can inhibit fungal growth. However, don’t leave your equipment under direct sunlight for extended periods, as it can damage other parts.
  • Camera Rain Covers: If you’re shooting in rainy or misty conditions, use a rain cover to protect your camera and lens from getting wet.

Best Humidity Level For Camera Dry Box – Prevent Lens Fungus

As we now know, moisture and dust can be destructive to cameras and lenses. 

High humidity levels, especially those around 65-70% or higher, can cause damage to lenses and parts of the camera body due to oxidation (rusting) or fungal growth. 

In conditions of high atmospheric humidity, fungal spores can grow and spread beneath the coatings of camera lenses, causing permanent damage.

To ensure the longevity and optimal performance of camera equipment, it’s best to maintain them in a humidity-controlled environment. The recommended humidity level for storing cameras and lenses is between 40% and 50% RH (Relative Humidity). 

If the ambient humidity exceeds this range, using a camera dry box can help reduce the humidity, preventing the equipment from becoming a breeding ground for lens fungus.

If you are unfamiliar with dry boxes, you can learn more here.

A quality camera dry box can consistently maintain air humidity between 40% and 50% RH throughout the year, ensuring the safety of your camera equipment.

Ruggard EDC-50L Dry Box

How To Lower Humidity In a Dry Box

Lowering the humidity in a dry box to 40% and 50% RH is necessary to protect sensitive items, especially camera equipment, from moisture damage. 

By implementing these measures and regularly monitoring the humidity level inside your dry box, you can effectively maintain a low-humidity environment, protecting your sensitive equipment from moisture-related damage.

Here’s how you can achieve and maintain a lower humidity level in a dry box:

Use Silica Gel Packs

  • Silica gel is a desiccant that absorbs moisture from the air. Place several silica gel packs inside the dry box to help reduce the humidity.
  • emember to check the silica gel packs periodically. Once they become saturated (often indicated by a color change), they need to be replaced or recharged by baking in an oven according to the manufacturer’s instructions.

Electronic Dry Cabinets

  • Some dry boxes come with built-in electronic dehumidifiers. These cabinets allow you to set a desired humidity level, and the system will automatically maintain it.
  • Ensure that the cabinet is sealed properly to prevent external humid air from entering.

Increase Air Circulation

  • If your dry box doesn’t have a built-in fan, consider adding a small battery-operated fan to improve air circulation. This can help in distributing the moisture evenly and aiding the desiccants in absorbing it more effectively.

Regularly Check the Seal

  • Ensure that the dry box is sealed tightly. Any gaps or cracks can allow humid air to seep in. If the seal is damaged, consider replacing it or using weather stripping to enhance the seal.

Use a Hygrometer

  • A hygrometer measures the humidity level inside the box. By monitoring it regularly, you can take action when the humidity starts to rise.
  • Some electronic dry cabinets come with built-in hygrometers, but if yours doesn’t, consider purchasing a separate one.

Regular Maintenance

  • Clean the dry box periodically to ensure there’s no dust or debris that might absorb and retain moisture.
  • If your dry box has an electronic dehumidifying system, follow the manufacturer’s instructions for maintenance and cleaning.

Avoid Opening Frequently

  • Every time you open the dry box, you allow humid air from the outside to enter. Try to minimize how often you open the box, especially during humid days.

Store in a Cool Place

Use Charcoal:

  • Activated charcoal can also act as a natural desiccant. Place some in a breathable bag or container and put it inside the dry box.

Regularly Empty the Water Reservoir

  • Some electronic dry cabinets have a reservoir that collects water as it dehumidifies. Ensure you empty this regularly to prevent overflow or increased humidity.

How To Set Humidity In a Dry Cabinet

Setting the humidity in a dry cabinet is important for protecting your photographic gear from moisture-related damage. 

By following these steps and regularly monitoring the humidity level, you can ensure that your dry cabinet provides an optimal environment for storing sensitive equipment, protecting it from potential moisture-related damage.

Here’s a step-by-step guide on how to set the humidity in a dry cabinet:

Understand the Desired Humidity Level

  • For camera equipment, the recommended humidity level is typically between 40% and 50% relative humidity (RH). This range ensures optimal protection against fungal growth without being too dry.

Turn On the Dry Cabinet

  • Plug in the dry cabinet and switch it on. Allow it to run for a few hours to stabilize, especially if it’s the first time you’re using it or if it’s been off for an extended period.

Locate the Humidity Control Dial or Digital Panel

  • Most dry cabinets come with either a manual control dial or a digital control panel. This is where you’ll adjust the humidity settings.

Adjust the Humidity Setting

  • For a manual control dial: Turn the dial to the desired setting. There might be markers indicating “Low,” “Medium,” and “High.” Start with a medium setting and adjust as necessary based on the readings from the hygrometer.
  • For a digital control panel: Use the buttons or touchscreen to set the desired humidity level. Some cabinets allow you to input the exact percentage.

Monitor Using a Hygrometer

  • Most dry cabinets come with a built-in hygrometer, which displays the current humidity level inside the cabinet. If yours doesn’t have one, consider purchasing a separate digital hygrometer to place inside.
  • After adjusting the settings, monitor the hygrometer to ensure the cabinet reaches and maintains the desired humidity level.

Fine-Tune as Necessary

  • Depending on the external environment and the accuracy of the cabinet’s system, you might need to fine-tune the settings over the first few days to achieve the desired humidity level consistently.

Regularly Check the Humidity Level

  • Even after setting the desired level, it’s essential to check the humidity regularly, especially during seasonal changes or if the cabinet is placed in a location with fluctuating humidity.


  • Ensure the cabinet’s seals are intact to prevent external humid air from entering.
  • Clean the cabinet periodically and ensure that the dehumidifying components are functioning correctly.

Avoid Frequent Opening

  • Minimize how often you open the cabinet, especially during humid days, to maintain the set humidity level.

Wrap Up

Protecting camera equipment from the adverse effects of humidity is part of being a photographer, be it a professional or a hobbyist. 

The delicate internal components of cameras and lenses are susceptible to moisture, which can lead to issues like fungal growth and reduced performance. 

Striking the right balance, with an optimal humidity level of 40% to 50% RH, is essential for the longevity and functionality of these tools of the trade. 

Dry cabinets are one of the best tools to combat moisture, offering a controlled environment tailored for equipment preservation. 

Understanding and harnessing the capabilities of these cabinets, coupled with regular monitoring and maintenance, you can know that your cherished equipment remains in pristine condition, safeguarded from the unpredictable whims of humidity. Especially if you have a vintage lens.

Additional Resources:
Beyond Photo Tips
DP Review

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