Quick verdict: Choose fixed ND for a known amount of light reduction and a deliberate photo setup. Choose variable ND when adjusting exposure quickly for outdoor video is worth the design’s limitations.
Research-based buying guide; no hands-on testing is claimed. As an Amazon Associate, Time to Get Outside earns from qualifying purchases.
| Decision | How the options compare |
|---|---|
| Adjustment | Fixed ND: Change filters to change the stated density Variable ND: Rotate within the model’s usable range |
| Best buying reason | Fixed ND: A repeatable exposure requirement Variable ND: Convenient changes as outdoor light varies |
| Check carefully | Fixed ND: Density notation, size and stacking needs Variable ND: Usable range, wide-angle limits and cap size |
First decide why you need less light
A neutral-density filter reduces the light reaching the camera. That can let you use a deliberately longer exposure for moving water or keep chosen video settings in bright conditions. If you do not have a specific exposure problem, an ND filter is not automatically a useful first accessory.
A fixed filter provides a stated density. A variable filter changes density as you rotate its elements. The variable design can replace some filter changes, but it is not simply a complete fixed-filter set with no trade-offs. Buy for the exposure range you need rather than the largest advertised range.
When a fixed filter is enough
For a repeated landscape setup where you know the light reduction you want, one appropriate fixed filter can be straightforward and economical. Check whether the listing expresses strength as stops, optical density or a filter factor; similar-looking numbers can describe different scales.
A small selection of useful strengths may serve you better than a large bargain set. Consider how often you will swap filters and how you will keep them clean beside a trail or shoreline. If changing light is not interrupting your work, paying extra for rapid density adjustment may solve a problem you do not have.
When variable density earns its premium
Variable ND is attractive for outdoor video when you want to adjust incoming light while maintaining your selected shutter and aperture choices. Check the manufacturer’s actual usable range and the limitations with your lens. A convenient adjustment is valuable only if the results remain acceptable across the settings you will use.
HOYA’s Variable Density II guidance specifically warns of a cross-like dark pattern near its maximum setting and notes wide-angle vignetting risks. It also uses an enlarged front frame requiring a larger cap for a given mounting size. Those are useful model-specific checks, not reasons to assume every variable filter has identical limits.
Keep the comparison practical
Do not buy a variable ND expecting it to replace a circular polarizer for controlled reflections. Different filters can involve polarization but serve different photographic purposes. Check suitability for the camera and lens rather than relying on the word variable alone or assuming a filter recommended for a phone fits a conventional lens.
Compare the correct thread size, any needed rings and caps, and delivered Canadian-dollar price. My starting point is one suitable fixed ND for occasional deliberate still photographs, and a well-matched variable ND for regular outdoor video with changing light. Keep the money if your camera settings already produce the result you want without an additional filter.
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Sources and research notes
Specifications and guidance checked October 15, 2026. Recommendations are editorial judgments based on the cited details and use cases; they are not independent performance measurements.