77mm Putter Variable ND Filter ND2-ND400 (1-9 Stops) - Precision

In this review the K&F CONCEPT 77mm Putter Variable ND Filter is judged as a versatile, well-built option for photographers and filmmakers who need quick exposure control without swapping glass. The single biggest reason to buy is its precise putter-style frame and clearly marked stops from ND2 to ND400, which make incremental adjustments predictable for both stills and video. The review finds the glass quality and coatings strong points, while users who need absolute zero color shift at extreme stops may want to test for subtle cast before committing.

Key Features

• Import Optical Glass: Crafted from Japanese AGC optical glass with 28 multi-layer coatings to reduce reflections and preserve image clarity.
• Putter Design: The frame's putter-style control and marked stops let users dial in exposure precisely and read adjustments quickly.
• Wide Stop Range: Covers ND2 to ND400 (1-9 stops) so you can manage bright daylight or create motion blur without changing lenses.
• Durable Coatings: Hydrophobic, oil-proof, and scratch-resistant coatings on both sides protect the filter during outdoor use.
• Ultra-Slim Frame: A 7.4mm slim profile minimizes the risk of vignetting even on ultra-wide lenses down to about 16mm equivalents.
• Compatibility Note: Fits any lens with a 77mm thread and requires an 82mm lens cap for storage with this filter attached.

Who It's For

The filter is ideal for landscape photographers, run-and-gun filmmakers, and outdoor portrait shooters who want a single, durable variable neutral density solution. The clear stop markings and putter frame are particularly useful for video operators who need repeatable exposure changes and for photographers using long exposures in bright conditions.

It is less suitable for users who demand absolutely zero color cast across the full density range or who prefer dedicated fixed-stop glass for critical studio work. Also check your lens thread size before ordering and note the requirement for an 82mm cap when the filter is attached.

Pros & Cons

Pros

• High-quality Japanese AGC glass with extensive multi-layer coatings for reduced glare and improved contrast.
• Precise putter-style frame and marked stops make adjustments fast and repeatable.
• Durable hydrophobic and scratch-resistant coatings suit rugged outdoor use and easy cleaning.
• Ultra-slim 7.4mm frame helps avoid vignetting on wide-angle lenses.

Cons

• Some users report mixed results with color cast and ease of adjustment at darker settings, so performance can vary by setup.
• An 82mm lens cap is required for storage with the filter on, which may be inconvenient if you do not already have that size.

Specifications

Filter type	Variable Neutral Density (ND2-ND400)
Stop range	1 to 9 stops
Thread size	77mm
Glass	Japanese AGC optical glass
Coatings	28 multi-layer, hydrophobic, oil-proof, scratch-resistant
Frame thickness	Ultra-slim 7.4mm
Storage note	Requires 82mm lens cap when attached

Our Verdict

The K&F CONCEPT 77mm Putter Variable ND is a strong value for outdoor photographers and videographers who need flexible exposure control and durable construction. Its precise putter frame, robust coatings, and high-quality AGC glass make it a practical single-filter solution, though users sensitive to color cast at extreme densities should verify performance on their system first.

Frequently Asked Questions

Will this filter fit my lens?
It fits lenses with a 77mm thread; check your lens barrel for the diameter symbol to confirm before ordering.

Does it cause vignetting on wide-angle lenses?
The ultra-slim 7.4mm frame is designed to avoid vignetting even at wide angles, but very extreme wide setups should be tested.

How durable are the coatings?
Both sides have hydrophobic, oil-proof, and scratch-resistant multi-layer coatings for good protection in field use.