Half-Frame Camera Filter SEAGULL SB951 72mm Blue (Half-Frame, 72 mm)

The SEAGULL SB951 72mm Blue half-frame (graduated) screw-in camera filter creates a smooth blue color transition across the image plane. Mounted on lenses with a 72 mm front thread, this graduated filter is intended to balance bright skies and darker foregrounds, reduce exposure contrast, and introduce cooler color tones in landscape and outdoor photography. The filter's half-frame design places the strongest blue tint at one edge of the frame that gradually fades toward the opposite edge, allowing controlled color grading in-camera without post-processing.

Advantages

This SEAGULL blue graduated filter delivers precise control over color balance and dynamic range at the time of capture. Its 72 mm screw-in construction ensures a secure, low-profile fit on compatible lenses. The gradual transition minimizes visible banding and preserves natural tonal relationships between sky and foreground. The filter is suitable for on-location adjustments to white balance and creative color effects while maintaining optical clarity important for high-resolution sensors.

Suitable for

• Landscape and nature photography where sky balance is needed
• Seascapes and coastal scenes to enhance blue tones
• Cityscapes with pronounced sky-to-ground contrast
• Outdoor portraiture with environmental color control

Key specifications

• Filter type: half-frame / graduated screw-in filter
• Color: blue graduated tint
• Thread size: 72 mm front thread
• Mount: screw-in metal or plastic ring compatible with 72 mm lenses
• Transition: gradual color fade from strong tint to clear area

How to use

Screw the SEAGULL SB951 filter onto a lens with a 72 mm front thread until it seats securely without overtightening. Compose the frame so the transition line of the graduated blue area aligns with the horizon or the boundary between sky and foreground. Rotate the filter slightly, if needed, to adjust the angle of the gradient. Evaluate exposure and white balance in-camera, and bracket exposures when high dynamic range is present. Remove the filter when shooting scenes that require neutral color balance or when the gradient enters unwanted parts of the composition.

Usage recommendations

Use the filter for moderate cooling of skies and selective color enhancement rather than extreme color shifts; pair with a neutral density filter or polarizer if reflection control or additional exposure reduction is required. Clean the filter surface with a microfiber cloth and suitable optical cleaner, and store it in a protective case to avoid scratches.