SEAGULL Half-Frame Blue Camera Filter 49mm SB1935

SEAGULL Half-Frame Blue Camera Filter 49mm SB1935 is an optical half-frame filter with a blue tint, made to fit lenses with a 49 mm thread. The filter covers only part of the image plane, producing a graduated or split-color effect: one portion of the frame receives blue coloration while the remaining area remains neutral. The design enables selective color correction or creative shading without needing post-processing, making it suitable for landscape, architectural and creative photography where a partial or graduated tint is desired.

Advantages

The half-frame blue filter delivers an immediate in-camera blue tone on a portion of the scene while preserving natural colors elsewhere, allowing precise control of color balance in one exposure. Its 49 mm screw mount provides straightforward attachment to compatible lenses, keeping the optical axis aligned and minimizing vignetting on compatible focal lengths. The physical filter eliminates reliance on digital grading for split-color effects and supports consistent results across multiple shots and lighting conditions.

Suitable for

• Landscape photography where sky or water needs a stronger blue cast in part of the frame
• Architectural shots requiring selective color emphasis on facades or glass
• Creative and experimental photography using split-color or graduated tint effects
• In-camera color correction when part of the scene needs to be balanced differently

Key specifications

• Filter type: half-frame (soft or hard edge depending on alignment)
• Tint color: blue, applied to a portion of the image
• Mount: 49 mm screw thread for front lens attachment
• Material: optical glass element in a metal or lightweight mounting ring (typical construction for precision filters)
• Effect: partial graduated blue shading for selective color control

How to use

Screw the filter into the 49 mm front thread of a compatible lens and compose the frame so the blue-tinted area aligns with the region you want to affect. For a smooth transition, adjust the vertical position of the filter if the filter design permits slight movement; otherwise tilt and recompose carefully to place the boundary of the tint. Meter and set exposure for the scene as usual; the blue section will alter color balance but typically not require major exposure compensation. Use a tripod for precise alignment when working with architectural or landscape compositions.

Usage recommendations

Use the SEAGULL Half-Frame Blue filter on wide to moderate telephoto lenses with a 49 mm thread and monitor the edge transition in-camera to ensure the tint aligns as intended. For stronger or subtler effects, combine the filter with neutral density or polarizing filters where compatible, and shoot in RAW if you plan to fine-tune colors later.