H&Y Filters HD MCR PureNight Filter - 77mm

Key Features

• Reduces Light Pollution in Night Sky
  
• Absorbs Yellow Sodium-Vapor Light
  
• Absorbs Yellow Mercury-Vapor Light
  
• Absorbs Yellow Light from Low CRI LEDs
  
• 2x Filter Factor, +1 Stop
  
• 9-Layer Multi-Coating, Optical Glass
  
• Aluminium Alloy Filter Ring
  
• 77mm Front Filter Threads
  
• Plastic Case
  

The 77mm Night Filter from H&Y Filters is designed to reduce the appearance of light pollution in images or video that include the night sky and illumination from artificial light sources. This effect can be obtained when this filter is used on a film camera system with daylight film installed or on a digital camera system with its daylight white balance setting selected.

Light pollution occurs in areas of the night sky that are above or near concentrated and intense sources of artificial light such as cities. These light sources can include exterior and interior lamps for commercial or residential buildings, brightly lit advertisements such as billboards, streetlamps, as well as sports and entertainment venues. Together, they can result in a type of light pollution known as skyglow, where individual stars, the Milky Way, and other astronomical features in the night sky are obscured. Additionally, artificial lights clustered together can become difficult to individually discern. Light pollution from these "cluttered" sources can become a source of distraction within an image and can resemble overexposed areas of glare.

When used, the 77mm Night Filter can improve the results of night-time images by absorbing the yellow light from sodium-vapor lamps, mercury-vapor lamps, or low Colour Rendering Index LEDs, common light sources within urban areas. By preventing the dominant wavelengths of light associated with the colour of those lamps from being recorded, the visibility of astronomical objects is enhanced, and artificial light sources are more clearly defined with less glare and improved contrast.

This 77mm Night Filter is constructed from optical glass for clarity as well as colour fidelity and features an aluminium alloy filter ring for durability while remaining lightweight. Each side of this filter includes eight layers of anti-reflection coating to prevent internal ghosting and reflections as well as an anti-smear nano coating for an improved beading effect when in contact with water or oil for greater cleaning efficiency.

• Reduces the appearance of light pollution in images or video that include the night sky and illumination from artificial light sources.
  
• For cameras with daylight film installed, or a digital camera system with its daylight white balance setting selected.
  
• Absorbs the yellow light from sodium-vapor lamps, mercury-vapor lamps, or low Colour Rendering Index LEDs, common light sources within urban areas.
  
• Enhances the visibility of astronomical objects, and, where they appear, artificial light sources are more clearly defined with less glare and improved contrast.
  
• 2x filter factor reduces exposure by 1 stop.
  
• Constructed from optical glass for clarity.
  
• Each glass surface includes eight layers of anti-reflection coatings to prevent internal ghosting and reflections as well as an anti-smear nano coating for an improved beading effect when in contact with water or oil for greater cleaning efficiency.
  
• Aluminium alloy filter ring is durable while remaining lightweight.
  
• 77mm front filter threads allow for use with other filters.
  
• Plastic filter case for storage and transport
  

Specifications 

• Filter Type: Light Pollution
  
• Filter Factor: 2x (1-Stop)
  
• Size: 77 mm Rear Filter Thread 
  
• Front Accessory Thread / Bayonet: 77 mm
  
• Coatings: Multi-Coating
  
• Filter Material : Glass