Reinventing Split-Focus with a Half Filter Design
PolarPro’s Split 50 looks unconventional at first glance: one half of the circular filter is optical glass, the other half is left clear. This deliberate half filter design is what unlocks its split focus filter capabilities, echoing classic cinematic filter effects in a compact form factor. By combining a +2 diopter on only one side with untouched glass on the other, the Split 50 creates two focal planes in a single frame, allowing foreground and background subjects to remain sharp together. Instead of covering the entire lens with a diopter, creators can selectively introduce magnification where it matters most. The result is a cleaner, more flexible approach than traditional, fully covered filters, delivering the visual drama of split-focus compositions without the bulk or complexity of larger cinema rigs.
How the Split 50 Creates Dual Focal Planes
The Split 50’s optical trick is straightforward yet powerful. The diopter half shifts the focal distance for whatever falls behind it, effectively pulling that portion of the scene closer to the lens. The clear half leaves the remaining area untouched, preserving the original focus distance. That contrast enables two subjects at very different distances to appear sharp within the same frame, while areas outside those zones still carry the shallow depth-of-field look many creators love. PolarPro recommends using the split focus filter between f/1.2 and f/4 to keep the transition between the two focal planes smooth and cinematic, avoiding harsh borders. Because the filter is rotatable, creators can align the split line precisely across the frame—horizontally, vertically, or diagonally—depending on where they want to place their subjects and how they want to balance tension and depth.
From Hollywood Heritage to Modern Creator Workflows
Split diopters have a long history in filmmaking, where they’ve been used to build tension and layered compositions by keeping both foreground and background characters in focus. PolarPro’s Split 50 brings that language of classic cinematic filter effects into modern mirrorless and DSLR workflows without requiring heavy cinema lenses or complex rigs. Instead of relying on digital compositing to blend multiple focus pulls, creators can capture split-focus shots entirely in-camera. This yields more organic transitions, natural bokeh, and authentic optical artifacts that are difficult to replicate convincingly in post. The half filter design also means less glass in front of the lens, helping maintain contrast and clarity while still delivering dramatic visual separation. For photographers and filmmakers exploring practical in-camera effects, the Split 50 offers a portable, intuitive way to experiment with storytelling through focus.
Simplifying Filter Systems with Split and Magnetic Options
Beyond its creative optical behavior, the Split 50 is designed to slot seamlessly into existing filter workflows. PolarPro builds it with Cinema Series optical glass and protective coatings in a CNC-machined aluminum frame, aligning it with professional-grade magnetic filter systems and threaded setups. The filter is available in several threaded sizes, and there is also a version compatible with PolarPro’s Helix MagLock magnetic filter systems, which uses a separately sold base plate. This integration means creators can combine the split focus filter with other tools like ND or diffusion filters, stacking or swapping as needed without constantly rebuilding their rigs. Compared to traditional full magnetic filter kits that cover the entire lens, the Split 50’s half filter design is a novel approach, focusing optical power only where it’s needed and reducing redundancy in multi-filter setups.
