Camera Filter SEAGULL SB756 58mm Half-Frame Blue Screw-In Optical Filter

The SEAGULL SB756 58mm Half-Frame Blue Screw-In Optical Filter is a threaded glass filter designed to fit lenses with a 58mm front thread. It produces a controlled blue tint across part of the image, allowing photographers to adjust color balance for creative effects or technical use. The filter mounts directly to the lens and occupies a half-frame area, enabling partial blue shift while leaving the rest of the frame unaltered for split-tone compositions, demonstrations, or mixed lighting corrections.

Advantages

This screw-in optical filter offers precise color modulation without digital post-processing, providing consistent blue tinting in-camera. The half-frame design enables selective application across the image for side-by-side comparison, split-grad effects, or instructional demonstrations. The 58mm thread makes the filter compatible with a broad range of consumer and prosumer lenses that share this common size, while the optical glass maintains image clarity and minimizes unwanted reflections when used with appropriate lens hoods and angles.

Suitable for

• Creative photography requiring partial or split-blue tint effects
• Color balance adjustments in mixed lighting or stage setups
• Laboratory, classroom, or instructional demonstrations of color shift
• Portrait, landscape, and still-life shoots where selective blue correction is desired

Key specifications

• Filter type: half-frame blue screw-in optical filter
• Mount diameter: 58 mm screw thread
• Coverage: half-frame (partial image tinting)
• Material: optical glass element in metal screw mount
• Intended use: color correction and creative blue tint effects

How to use

Screw the SEAGULL 58mm SB756 filter onto the front thread of a compatible lens until it seats securely; avoid overtightening. Position the camera and compose so the coated half covers the portion of the frame you want tinted blue. For best results, check exposure and white balance and make small adjustments to compensate for the blue shift. Use in-camera metering and preview images on the camera screen or histogram to confirm the effect before final shooting. Remove the filter when full-frame, neutral color capture is needed.

Usage recommendations

When using the SEAGULL half-frame blue filter, pair it with a lens hood to reduce stray light and consider slight exposure compensation if the blue tint affects metering. For critical work, shoot test frames at different angles to find the desired transition between tinted and untinted areas. Store the filter in a protective case when not in use to prevent scratches and dust.