Ah, the variable ND filter from K&F Concept—strong in the ways of the Force, it is. Crafted with the precision of a lightsaber duel, its Japanese AGC optical glass, multi-coated with 28 layers, shields against the dark side of glare and reflections. Clarity, it bestows. The putter adjustable design, clever it is. Like a Jedi adjusting his focus in battle, one may fine-tune the stops with ease, rotating the frame with the grace of a master wielding his blade. From ND3 to ND1000, versatility this filter grants, useful across many landscapes and scenarios. Waterproof and scratch-resistant, it is. Strong against the elements, it stands. Oil-proof and hydrophobic, like a Jedi’s robes repelling the chaos of the galaxy, this filter remains resilient through the trials of adventure. Vignetting, it does not—unless the wrong lens thou useth! A slight dark "X" may appear, but turn the frame, and balance in the Force is restored. Turns water into smooth, wispy trails even in bright light, this filter does. Like the flowing energy of the Force, movement transforms into an ethereal dream. But heed this warning, young Padawan—manual mode, you must use. Settings to Master the Force of the Filter: Shutter Speed: Slow, you must make it. 1/4s to 30s, depending on water’s movement and light. The longer the exposure, the smoother the trails. Aperture: f/8 to f/16 is wise, for clarity and depth, it ensures. But adjust, you may, depending on conditions. ISO: Keep it low—100 or 200, lest noise disturb the balance of your image. Focus: Manual focus, use. For sharpness, a Jedi does not rely on the camera alone. Also works great at night, it does! For streaking lights as they pass by, perfect it is. Speeder bikes on Endor, landspeeders on Tatooine, or city streets in Coruscant—long exposures, you must use. Night Photography Settings for Light Streaks: Shutter Speed: 10s to 30s, for motion trails that flow like the Force. Aperture: f/8 to f/11, for balance between light intake and sharpness. ISO: 100-400, depending on ambient light. Too high, and noise will corrupt the image. Tripod: Essential, it is. A Jedi’s hands, steady they may be, but long exposure requires stillness beyond mortal ability. Compatible with all 77mm lenses, this filter is, but beware—an 82mm lens cap, thou wilt require. Such knowledge, crucial it is, lest disappointment consume thee. Verdict: In the ways of photography, a Jedi must always choose his tools wisely. Strong with the Force, this filter is. Recommended, it comes highly.