SEAGULL half-frame camera filter blue 55mm SB755

SEAGULL half-frame camera filter blue 55mm SB755 is a screw-in graduated blue filter designed for lenses with a 55 mm filter thread. The SB755 creates a controlled blue tint that transitions across the frame, allowing in-camera color correction and subtle creative effects without digital post-processing. Lightweight and compact, the filter installs directly onto compatible lenses and preserves optical alignment while introducing a soft color gradient useful for landscape, cityscape and portrait applications.

Advantages

The graduated design provides a smooth transition from clear to blue, enabling selective color influence across the image plane. As a screw-in 55 mm filter, it mounts securely to lenses with matching threads, minimizing vignetting on standard and telephoto focal lengths. The optical glass maintains image sharpness and contrast while offering consistent color cast across exposures. Its metal or resin frame ensures reliable attachment and straightforward handling in the field.

Suitable for

• Landscape photography to enhance skies and water tones
• Cityscapes and architecture to add atmospheric blue grading
• Portraits where selective cool tones are desired
• On-location shoots where in-camera color control is preferred over digital grading

Key specifications

• Filter type: half-frame graduated blue filter
• Mounting: screw-in design for 55 mm filter thread
• Optical material: precision glass element for image clarity
• Finish: thin filter ring to reduce vignetting on many lenses
• Application: color correction and creative in-camera grading

How to use

Screw the filter onto the front of a lens with a 55 mm filter thread until it seats firmly but without over-tightening. Align the graduated transition so the blue tint covers the portion of the scene you intend to affect — for example, align the colored half with the sky in landscape shots. Expose and white balance as needed to account for the introduced cool tone; shooting in RAW allows more flexible adjustments afterward. Remove the filter when no color grading is required or when changes to composition require a different gradient placement.

Usage recommendations

Use the SEAGULL half-frame blue filter when you need consistent in-camera cooling of upper frame elements; combine with polarizers or neutral density filters only if filter thread stacking does not introduce vignetting. Store the filter in a protective case when not in use and clean the optical surfaces with a microfiber cloth and appropriate lens cleaner to maintain image quality.