The 150 x 170 mm graduated neutral density filter obscures the bright areas of an image, such as the skies, without affecting the rest of the frame.
The 4x filter factor provides a light reduction of up to 2 points...
Xenon instead of Krypton as filling gas (XENOPHOT HLX versions)
Luminous flux up to 10% higher with same power consumption (XENOPHOT HLX versions)
HLX Tungsten Low-voltage halogen lamp with or without reflector...