K&F Split Diopter Center Field NANO-B 67 mm photographic filter

The K&F Split Diopter Center Field NANO-B 67 mm photographic filter is an optical accessory designed for creative imaging with lenses that accept 67 mm filter threads. The filter produces a split-diopter effect by combining two different focal planes within a single frame, allowing sharp focus in the center area while keeping the peripheral area at a different focus distance. Constructed from coated optical glass, the filter reduces internal reflections and preserves contrast while enabling compositional techniques that merge foreground and background focus in one exposure.

Advantages

The filter offers a compact, screw-in design compatible with lenses that have 67 mm threads, making it simple to mount and remove without additional hardware. Its coated glass construction minimizes flare and ghosting, maintaining image clarity when working with challenging light. By allowing simultaneous focus planes, the split diopter expands creative options for cinematography and still photography without the need for focus stacking or complex composite workflows.

Suitable for

• Cinematic shots that require simultaneous foreground and background focus
• Portraits and environmental portraits blending subject and context
• Creative still photography, including narrative and conceptual work
• On-location shooting where maintaining two focus planes in-camera is preferred

Key specifications

• Filter type: split diopter (center field)
• Thread size: 67 mm
• Material: coated optical glass
• Effect: half-frame diopter combining two focal planes
• Mount: screw-in filter ring compatible with 67 mm threads

How to use

Screw the split diopter filter onto the front of a lens with a 67 mm filter thread until it is secure. Compose your shot and focus the lens on one plane (for example, the foreground) using standard focusing methods. Then, adjust the subject or lens position to bring the secondary plane into acceptable focus in the opposite portion of the frame. Fine-tune exposure settings and white balance as needed; the coated glass reduces reflections but may still require slight exposure compensation when shooting into bright light sources. Remove the filter when the split-diopter effect is no longer desired.

Usage recommendations

Use the K&F Split Diopter Center Field NANO-B for planned compositions where the visual separation between the two focus planes enhances storytelling. Test the effect at different apertures and distances to control the apparent depth and edge transition between the focused and defocused areas. When shooting video, lock exposure and white balance to prevent noticeable shifts between the two planes during a take.