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Filters > Pass Filters > Astronomik > ProPlanet > Astronomik Filters ProPlanet 742 T2 IR bandpass filter
Product no.: 43755

Filters ProPlanet 742 T2 IR bandpass filter

$ 108.00 incl. VAT, plus shipping costs
short-term
ready for shipping in 3-7 days + lead time

Product description

Astronomik ProPlanet 742 IR-pass filter

Ideal filters for the reception of the moon and planets, notably Mars, with telescopes from 6" (150mm) aperture.

The ProPlanet IR 742 only allows infrared light with wavelengths of more than 742 nm to pass. In this wavelength range the effects of seeing are significantly lower than in the visible spectrum of the human eye. This allows much sharper images than are usually obtained from your device and location. Another advantage is that the sky background of advanced dawn is dark and so the filter even allows photography of the planets and the moon at daylight.

Main use

The Astronomik ProPlanet IR 742 cuts off the visible part of the spectrum and allows the light of wavelengths longer then 742nm to pass. Due to this behavior the part of the spectrum that is most sensitive to bad seeing is rejected. This approach does a big improvement to the imaging of planets and the moon. The image is more steady than the image in the visible light with nearly identical exposure times.

Specifications

Capacity


Connection
T2 (M42 x 0,75)
Frame
T2 (M42 x 0,75)

General


Series
ProPlanet
Type
Filters
Type of build
Pass Filters

Area of application


Mars
yes
Moon
yes
Comets
yes
Useful for photographs
yes
Anti light-pollution
yes
Astronomik Filters ProPlanet 742 T2 IR bandpass filter
How do I interpret these transmission curves?

  • the wavelength is plotted in nanometers on the horizontal axis. 400nm corresponds to deep blue, 520nm to green and at 600nm to red
  • transmission, in %, is plotted on the vertical axis
  • visual filters: The gray curve shows the relative sensitivity of the dark adapted human eye at night
  • photographic filters: The gray curve shows the relative sensitivity of a typical CCD sensor
  • orange: the main emission lines which contribute to artificial sky glow, e.g lines from mercury (Hg) and sodium (Na)
  • green: the most important emission lines from nebulae, such as the lines from hydrogen (H-alpha and H-beta) and the lines from oxygen (OIII)

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