Lens Filter SEAGULL SB754 52mm Half-Frame Blue (Half-Color) Optical Filter

SEAGULL SB754 52mm Half-Frame Blue (Half-Color) Optical Filter is a screw-in glass filter for interchangeable-lens cameras that applies a blue tint to half of the image area while leaving the other half clear. With a 52mm thread diameter, the filter mounts directly to lenses with matching threads and creates a gradual, in-camera color transition useful for creative and practical photographic effects. The design preserves center sharpness and allows normal exposure metering across mixed color regions.

Advantages

This half-frame blue filter enables in-camera color gradients without post-processing, offering precise placement of the colored area through framing and lens tilt. The screw-in construction ensures stable attachment and compatibility with lenses that accept 52mm filters. Optical-grade glass provides consistent color quality and minimal impact on image sharpness. The half-color layout makes it possible to balance exposures and color tones across a single frame for controlled creative results.

Suitable for

• Landscape photography where a blue tint enhances sky or water tones
• Portraits and environmental portraits requiring selective color accents
• Creative and artistic photography with graduated color effects
• In-camera color experiments without relying on digital editing

Key specifications

• Filter type: half-frame / half-color blue
• Mount diameter: 52 mm screw-in
• Material: optical glass element with metal or plastic ring (depending on production batch)
• Effect: gradual blue tint across half of the frame, clear on the remaining half
• Compatibility: designed for lenses with 52 mm front thread

How to use

Screw the SEAGULL SB754 filter onto the front thread of a lens with a 52 mm diameter, ensuring the colored half is oriented to cover the desired portion of the scene. Compose the shot so the border between tinted and clear areas falls where you want the graduated color shift to occur. Meter exposure as usual; autofocus and metering remain functional with the filter attached. Adjust camera angle, tilt, or subject placement to refine the transition line and achieve the intended artistic effect.

Usage recommendations

Use the filter outdoors for enhancing skies and water or in controlled studio setups for selective color accents. When shooting high-contrast scenes, check exposure near the boundary between color and clear areas to avoid unwanted clipping. Store the filter in a protective case and clean with a microfiber cloth and appropriate lens cleaner to maintain optical performance.