Heliopans world-renowned Hasselblad Bay 60 Neutral Density Filter allows for a longer exposure without offsetting overall color and tonality. GND filters have the acute ability to balance light intensity in one part of a scene with another while transitioning between the two, often imperceptibly. This is especially important under bright light conditions where a properly exposed foreground results in a washed-out, over-exposed sky while exposing for the sky will leave the foreground too dim and under-exposed. The ND filter also allows for a longer shutter speed and wider aperture than normally required, perfect for capturing life in motion.Neutral Density Factors: ND.3 (exposure adjustment = 1 stop, reduces ISO 1/2), ND.6 (exposure adjustment = 2 stops, reduces ISO 1/4), ND.9 (exposure adjustment = 3 stops, reduces ISO 1/8), ND1.2 (exposure adjustment = 4 stops, reduces ISO 1/16). | Our standard 8-Layer Multi-Coating minimizes reflections and does not interfere with the resolution of your camera optics | Constructed from the highest German Schott Optics, which guarantees incredible optical resolution. Our glass is specially ground and polished to minimize internal reflections, while ensuring that the quality of your images are not degraded by using our optics in front of your lens. It is also specially hardened to resist most impacts | Our precision cut brass ring ensures a secure and sturdy fit, are more resistant to side impacts, and less likely to bind or cross-thread after extended use | We do not source any materials outside of Germany in the assembly and construction of our products. All raw materials are prepared and hand-assembled in our factory and do not leave our facility until they are completely inspected by our quality technicians