Best Overall
K&F Concept 77mm Nano-X Variable ND
Key details
- Coatings
- 28 multi-layer
- Stop Range
- 1-9 stops (ND2-ND400)
- Thread Size
- 77mm
- Frame Thickness
- 7.4mm
A variable ND is only as good as the ring you turn, and this one puts a small lever on the frame instead of a knurled edge. That sounds minor until you are behind a tripod at a slow shutter: you push the lever with one finger, watch the exposure move, and never wrap a hand around the barrel and jog the framing. Add 28-layer coatings on Japanese AGC glass and a 7.4mm frame, and this is the most complete variable ND of the ones we compared.
The coating stack is the part that is easy to skim past. Twenty-eight layers on both sides, rated hydrophobic, oil-proof and scratch-resistant, is a real advantage at the coast: spray and fingerprints wipe away instead of smearing into the glass, so you spend less of a shoot cleaning. The frame is slim enough that K&F claims clean corners down to 16mm, and on an ultra-wide it barely adds depth in front of the lens.
It is the most expensive filter here, and the premium is legible once you have handled it: coatings, machined frame and lever are what you are paying for rather than a badge. Where it earns that back is changeable light. A cloud crosses the sun during a take, a subject walks from shade into full sun, and you push the lever a few millimeters instead of swapping filters and re-metering.
Pros
- One-finger side lever keeps the frame steady
- 28-layer coatings shed water, oil and scratches
- Slim 7.4mm frame suits ultra-wide lenses
Cons
- Front threads won't hold a lens cap
- Over-rotating past maximum brings the X pattern
For anyone shooting stills and video outdoors on the same camera, this is the variable ND we reach for first: the side lever makes density changes repeatable with one finger.