In photography and optics, a neutral density filter or ND filter can be a colorless (clear) or grey filter. An ideal neutral density filter reduces and/or modifies intensity of all wavelengths or colors of light equally, giving no changes in hue of color rendition.
The purpose of standard photographic neutral density filters is to allow the photographer greater flexibility to change the aperture, exposure time and/or motion blur of subject in different situations and atmospheric conditions.
Important Information for Observing the Sun SPECIFICATIONS
Polarizer and neutral density filters need additional filtering (for example, Baader Herschel Prism or Baader Astro Solar Safety Film) before the eyepiece of the telescope for observations of the sun. Using without the appropriate filters can cause damage to the these filters and eyesight.
Baader 2" Neutral Density Filter with optical density ND 1.8 - Transmission 1.5% - Reduction factor 64. For perfect energy management during Lunar and Solar observation. Suitable for solar observing only as an additional filter! If you need to reduce glare and want to use a filter ahead of the focal point (e.g. before a binocular), then the neutral density filters are just right. Fine optical polish results in no loss of sharpness at high magnifications even with a filter position 20-30cm in front of the focal point. Phantom Group coated. No ghosting, reflections or stray light. Threaded both sides of the glass allows combination with other filters (e.g. Baader Colour Filters).
Weight - 0.066kg
Neutral Density - ND 1.8
Transmission Range - full Spectrum
Filter Thickness (without cell) - 2 mm
AR-Coating - Phantom Coating® Group, planeoptically polished
Transmission - 1.5%
Damping Factor - 64x
Filter size - 2"
Visual or Imaging? - visual, imaging
Filter Usage - Lunar, Planetary, Solar
Filter mounted - Mounted (LPFC 6mm)
Type of Filter - Neutral Density
Single or Set? - Single Filter
Filter shape - round