Fotodiox Pro 145mm Ultra Slim ND16 Filter - 4-Stop Motion & Aperture

In this review the Fotodiox Pro 145mm Ultra Slim ND16 filter is evaluated as a specialist tool for photographers and videographers who need reliable light reduction without vignetting. The bottom line: this single-threaded, ultra-slim ND16 4-stop filter is best for users of the WonderPana 145 and 66 systems who want to slow shutter speeds for motion blur or open apertures in bright light, while keeping color neutrality and minimal edge darkening.

Key Features

• Premium Grade Optical Glass: delivers an even, neutral gray that reduces light without introducing noticeable color cast for cleaner results.
• Ultra Slim Multi-Coated Ring: a 3mm-thick filter ring halves the profile of standard filters and helps prevent vignette when used with WonderPana holders.
• 4-Stop Light Reduction: the ND16 rating allows you to slow shutter speeds for smooth water and cloud motion or to use wider apertures in bright conditions.
• Single Threaded Design: the single thread and 145mm x 1mm standard filter thread ensure straightforward mounting on compatible holders and filter systems.
• Quality Construction: anodized aluminum ring offers durable, lightweight support for the glass while maintaining a slim profile for field use.
• Manufacturer Support: includes a 24 month manufacturer warranty for added peace of mind with regular use.

Who It's For

The Fotodiox Pro 145mm ND16 is aimed at landscape and long-exposure photographers who use the WonderPana 145 or 66 systems and require a neutral, low-profile filter to avoid vignette and preserve edge-to-edge clarity. Video shooters working in bright environments will also appreciate the fixed shutter speed compatibility that a 4-stop ND provides for controlling exposure.

Those who should look elsewhere include photographers who need variable ND control or smaller thread sizes; this product is a single-density, single-thread filter intended for holders and lenses that accept 145mm x 1mm threads and ultra-slim rings.

Pros & Cons

Pros

• Neutral 4-stop reduction lets photographers create motion blur and use wider apertures in bright light without color shifting.
• Ultra slim 3mm ring minimizes the risk of vignette when used with WonderPana Classic and Free Arc 145mm filter holders.
• Multi-coated glass improves color balance and reduces reflections for cleaner images.
• Solid anodized aluminum construction feels durable while remaining lightweight for field work.

Cons

• Single-density ND16 design lacks the flexibility of a variable ND when fine-tuning exposure is required.
• Large 145mm thread size limits compatibility to systems and lenses that accommodate that specific diameter.

Specifications

Filter Type	Neutral Density (ND16, 4-stop)
Glass	Premium grade optical glass, multi-coated
Filter Thread	145mm x 1mm single thread
Filter Ring Thickness	3mm ultra slim ring
Ring Material	Anodized aluminum
Compatibility	Works with WonderPana 145 and 66 systems
Warranty	24 month manufacturer warranty

Our Verdict

The Fotodiox Pro 145mm Ultra Slim ND16 is a focused, well-built solution for photographers and videographers who use WonderPana systems and need a reliable 4-stop reduction without vignetting. Its premium glass, multi-coating and slim anodized ring make it good value for those who require consistent neutral density and edge-to-edge clarity in bright conditions.

Frequently Asked Questions

Will this filter cause color cast?
Answer: The filter uses multi-coated premium optical glass and is designed to provide an even, neutral gray with minimal color shift.

Does the slim ring prevent vignetting?
Answer: Yes, the 3mm ultra-slim ring reduces the chance of vignette when used with WonderPana Classic and Free Arc 145mm holders.

Can I mount this on smaller lenses?
Answer: No, it is a 145mm x 1mm single thread filter and requires compatible holders or lenses that accept that size.