Combatting fog

Fog is a common challenge for amateur astronomers. In cold or humid environments, droplets and fog can form on telescope and camera lenses, reducing observation quality and affecting photos.

Vespera's hygrometric sensor is a smart accessory that detects the temperature and humidity levels at which fogging occurs on your station's lens.

It is especially useful for users in humid regions (near seas, oceans, rivers, lakes, ponds) or in cold climates. It's also ideal for winter conditions when temperatures approach 0°C.

Anti-fogging system
With the hygrometric sensor installed, Vespera’s built-in demister activates automatically when specific temperature and humidity thresholds are met. This system generates heat around the lens to remove fog, ensuring clearer viewing conditions and sharper images.

Improved focus and image quality
Fogging caused by condensation affects the focus of Vespera’s photos:

• Longer initialization and acquisition times: Fogging can result in more photos being rejected by Vespera’s advanced image-processing algorithms, which discard images of insufficient quality.
• Reduced sharpness: In astrophotography, the clarity of stars and the absence of halos are critical. Fogging diminishes this clarity.

By preventing fog, the hygrometer and demisting system improve both observation and image quality.

Compact and discreet design
Measuring under 13 mm, the hygrometer features the smallest electronic board ever designed by Vaonis engineers. It fits discreetly into Vespera’s optical arm and is compatible with filters. The sensor automatically manages the anti-fog system, turning it on and off as needed, so you never have to worry about it.