Why the stop range matters more than the brand
A variable ND filter lets you dial in light reduction by twisting the ring, but the number of stops it covers determines what you can actually shoot. A 1-5 stop filter is a subtle tool for wide-aperture video and modest motion blur. A 2-8 stop filter reaches much darker territory for long exposures and very bright conditions. The right range depends on your subject, your lens, and how much control you want before you hit the filter's limit.
How stops translate to real shooting situations
Each stop halves the light reaching your sensor. A 1-stop filter cuts light in half; a 5-stop filter cuts it to about 1/32 of the original. That is why a 1-5 stop range suits bright daylight where you want to keep a wide aperture for shallow depth of field, while a 2-8 stop range gives you room to slow shutter speeds dramatically for silky water or streaking clouds.
For video, the goal is often to maintain a fixed shutter speed while shooting wide open. The exact shutter speed depends on your frame rate and creative choice, so match the filter range to the light you expect. If you frequently shoot in harsh midday sun, the darker end of a 2-8 stop filter is more useful. If you mostly shoot in open shade or want fine control near the light end, a 1-5 stop range is easier to fine-tune.
Two real variable ND filters and their ranges
- ProMaster Variable ND Filter - Basis (2-8 Stops): The ProMaster Basis Variable ND Filter reduces exposure by 2 to 8 stops with a simple twist of the ring. This wide range covers bright sun and long exposures, replacing multiple fixed ND filters.
ProMaster Variable ND Filter - Basis (2-8 Stops) - ProMaster Variable ND Filter - Basis (2-8 Stops): Hard stops at both ends of the range prevent over-rotation and simplify adjustments. You can feel the limits without looking, which helps when you are changing exposure quickly.
- NiSi SWIFT True Color ND-VARIO Pro Nano 1-5stops Variable ND: The NiSi SWIFT True Color ND-VARIO Pro Nano adjusts exposure from 1 to 5 stops. This narrower range is easier to fine-tune for subtle light reduction and wide-aperture video.
NiSi SWIFT True Color ND-VARIO Pro Nano 1-5stops Variable ND - NiSi SWIFT True Color ND-VARIO Pro Nano 1-5stops Variable ND: Hard stops at each end of the ND range effectively eliminate the risk of the "X" effect. The X effect is a common variable ND problem; hard stops help you avoid crossing into it.
1-5 stops vs 2-8 stops: which range fits your work?
Choose based on the light you shoot in and the effect you want.
- 1-5 stops (NiSi SWIFT True Color ND-VARIO Pro Nano): Best for bright daylight where you want to keep a wide aperture or maintain a cinematic shutter speed without going too dark. The 1-stop minimum keeps the filter usable in softer light, and the 5-stop maximum handles typical outdoor video. It is less suited to extreme long exposures in harsh sun.
- 2-8 stops (ProMaster Basis Variable ND): Best for very bright conditions, long exposures, and creative motion blur. The 8-stop maximum lets you slow shutter speeds dramatically, but the 2-stop minimum means it is less useful in low light. This range replaces several fixed ND filters and suits both stills and video.
Threads, stacking, and front caps
Both filters offer front and rear threads, but the details differ. The ProMaster Basis has matching front and rear threads, so your existing lens caps fit and you can stack same-size filters. The NiSi SWIFT has a larger front filter thread that allows you to stack additional filters with minimal risk of vignetting, even on wide-angle lenses. If you plan to stack a polarizer or another filter, check the front thread size and expect some risk of vignetting with very wide lenses.
Neither product record lists a specific step-up ring or adapter requirement, so match the filter size to your lens's front thread diameter. The ProMaster Basis is available in sizes from 49mm to 82mm. The NiSi SWIFT is listed only in 77mm in the supplied information. If your lens is not 77mm, you would need a step-up ring, which is not confirmed by the supplied records.
Coatings and handling
- ProMaster Variable ND Filter - Basis (2-8 Stops): Polished, multi-coated optical glass resists reflections and flare. Better flare resistance helps preserve contrast when shooting toward bright light.
- NiSi SWIFT True Color ND-VARIO Pro Nano 1-5stops Variable ND: Nano Coating Technology provides anti-reflective properties and makes the filter water- and oil-resistant. Easier cleaning and durability matter if you shoot in adverse weather or near water.
- NiSi SWIFT True Color ND-VARIO Pro Nano 1-5stops Variable ND: The NiSi SWIFT features a removable rotating lever for smooth operation. A lever can make fine adjustments easier, especially when the camera is on a gimbal or tripod.
How to decide
Start with your typical light. If you shoot in bright sun and want the deepest light cut for long exposures, the 2-8 stop ProMaster Basis gives you more range at a lower price. If you shoot video at wide apertures and want fine control without going too dark, the 1-5 stop NiSi SWIFT is easier to tune and adds water- and oil-resistant coating plus a removable lever. Check your lens thread size first: the ProMaster comes in many sizes, while the NiSi is listed only in 77mm. Neither record confirms compatibility with step-up rings or other accessories, so verify your setup before buying.
