Manual gain control in night vision devices is a significant feature that enhances the usability and performance of these devices in various lighting conditions.

Adaptability to Changing Light Conditions:

Manual Gain Control allows the user to adjust the image brightness manually. This is crucial when moving between different lighting environments, such as transitioning from a dark interior to a moonlit outdoor area. By adjusting the gain, users can optimize the image quality for specific conditions, avoiding overly bright or dark images.

Improved Image Clarity:

In environments with variable ambient light, automatic gain might not always provide the best image. Manual gain allows users to fine-tune the image to reduce noise (graininess) or enhance details, leading to clearer and more detailed visuals, which can be crucial for target identification and situational awareness.

Battery Conservation:

By manually adjusting the gain to lower levels in brighter conditions, users can reduce the power consumption of the night vision device. This is particularly beneficial in extended operations where battery life is critical.

Customized User Experience:

Different users might prefer different levels of image brightness based on their vision, the environment, or the task at hand. Manual gain control provides the flexibility to adjust the device to personal preferences, ensuring comfort and effectiveness during use.

Situations with High Light Contrast:

In environments with a mix of light and dark areas, such as urban settings with streetlights or partial moonlight, manual gain control helps in balancing the image so that both bright and dark areas are visible without washing out important details.

Manual gain is a feature in night vision devices for users who need to control the brightness of the tube in challenging light conditions like in urban environments. It offers enhanced adaptability, image clarity, and user comfort, making it an important aspect for anyone using night vision in professional or tactical scenarios.

However, that feature has mostly the place in urban environments where we are challenging different bright light conditions, in RURAL environments like in the forest or placed outside the city it is a feature which is good to have but not necessarily important.