UV Filter SEAGULL SB2539 40.5mm for Cameras and Lenses

The SEAGULL UV Filter SB2539 with a 40.5mm thread diameter is a slim optical filter designed to reduce ultraviolet light reaching the lens and to protect the front element from dust, moisture and minor scratches. Made for lenses with a 40.5mm filter thread, this UV filter preserves image clarity in outdoor and landscape shooting by reducing atmospheric haze while remaining optically neutral in visible light. Its low-profile frame helps avoid vignetting on wide-angle lenses and allows continued use of lens caps and hoods.

Advantages

The SEAGULL UV filter provides passive ultraviolet reduction without altering color balance or exposure, maintaining natural tones in photographs. It offers mechanical protection for the front lens surface and helps keep optical coatings free from fingerprints and smudges. The slim metal ring minimizes the risk of vignetting on wide-angle optics and ensures a secure, threaded attachment to lenses with a 40.5mm diameter. The filter’s construction supports easy cleaning and long-term use in field conditions.

Suitable for

• Landscape photography where atmospheric haze reduction improves distant detail
• Outdoor and travel photography to protect the front element from dust and light impact
• General-purpose shooting on lenses with a 40.5mm filter thread
• Photographers who prefer leaving a protective filter mounted on the lens

Key specifications

• Filter type: Ultraviolet (UV) protective filter
• Mount diameter: 40.5 mm screw thread
• Frame profile: Low-profile/slim metal ring designed to reduce vignetting
• Optical effect: UV attenuation with neutral visible-light transmission
• Surface: Easy-to-clean coated glass suitable for routine handling

How to use

Screw the SEAGULL UV filter onto the front of a lens with a 40.5mm filter thread until it seats gently; avoid overtightening. Use the filter in outdoor and landscape shooting to reduce UV-induced haze, or keep it mounted as a protective cover during general photography. Clean the filter surface with a microfiber cloth and appropriate lens cleaning fluid when necessary to maintain optical performance. Remove the filter only when using accessories that require the bare lens or when attaching specialized filters or adapters.

Usage recommendations

When using the filter on wide-angle lenses, confirm compatibility to avoid vignetting; the slim frame is intended to reduce this risk. Store the filter in a protective pouch when not in use and clean it gently to preserve coatings and optical quality.