Astronomik UHC-E Filter

Astronomik UHC-E Filter
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£58.00
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In stock - Shipped 1-2 working days.

Model:  ak_uhc-e_125
Part Number:  8H00F0
Brand:  Astronomik

Astronomik

The Astronomik UHC-E filter is an excellent value filter for deep-sky observation of emission nebulae and comets under light polluted skies. It’s particularly suitable for small ’scopes.

The UHC-E Filter increases contrast of emission nebulae and comets and blocks the light of typical streetlights as well as airglow. It is best suited for telescopes up to 5" / 125mm.

FEATURES

  • Maximum transmission of 94%
  • Full width at half maximum 45nm
  • Transmission range 480nm to 525nm and 645nm+
  • Not sensitive to high humidity or ageing effects
  • Scratch-resistance!
  • Excellent quality substrate, diffraction limited - the optical performance of your telescope will not be reduced
  • Parfocal with other Astronomik filters
  • 1mm Glass Thickness
  • Supplied in a high-quality, long lasting, filter box

Main use

The Astronomik UHC-E filter provides a FWHM of 45nm and blocks the light of typical streetlights (e.g. sodium and mercury vapour) as well as airglow. Thus it increases contrast between your target and the night sky.

The contrast enhancement is less than that of the Astronomik UHC filter, but at the same time the transmitted amount of starlight is greater. It's therefore better suited to smaller telescopes.

As the UHC-E filter passes a spectral line of Carbon (due to the higher FWHM) it opens up the possibility of comet observation.

Other uses

  • Observation of Jupiter’s clouds.
  • Easier resolution of Double Stars.
  • Photography under light-polluted skies with DSLRs and other cameras.

Transmission Chart

  • The horizontal axis is the Wavelength in Nanometers (nm). 400nm is deep blue, at 520nm the human eye senses green and at 600nm red. At 656nm is the famous "H-Alpha" emission line of hydrogen.
  • The transmission in % is plotted on the vertical axis.
  • The blue line shows the transmission of the filter.
  • The most important emission lines from nebulas are shown in orange. The most important lines are from ionised Hydrogen (H-alpha and H-beta) and double ionised oxygen (OIII).

The major emission lines of artificial light pollution:
| Hg 435,8nm | Hg 546,1nm | Hg 577,0nm | Hg 578,1nm |
| Na 589,0nm | Na 589,6nm | Na 615,4nm | Na 616,1nm |

The major emission lines of nebulas:
H-β 486,1nm | OIII 495,9nm | OIII 500,7nm | H-α 656,3nm

Suitability

  • Visual observation (dark skies): Reasonable, an UHC filter is more suitable
  • Visual observation (urban skies): Good, for telescopes up to 125 mm aperture and medium exit pupil
  • Film photography: Good, but very long exposure times
  • CCD photography: Good, when used with an additional IR-block-filter
  • DSLR photography (original): Good, colour balance is near perfect
  • DSLR photography (astro modified): Good, colour balance is near perfect
  • DSLR photography (MC modified): Good, when used with an additional IR-block-filter
  • Webcam / Video (Planets): Unsuitable
  • Webcam / Video (Deep Sky): Very good, if light pollution is a big problem

Technical Data

  • Maximum transmission of 94%
  • Full width at half maximum 45nm
  • Transmission range 480nm to 525nm and 645nm+
  • Scratch-resistant!
  • Excellent carrier material. The optical performance of your telescope is not reduced by the filter in any way.
  • Parfocal with other Astronomik filters
  • Glass thickness: 1mm
  • Completely resistant against high humidity, scratches and ageing effects
  • Diffraction limited, the filter will not reduce the optical performance of your telescope!
  • Astronomik filters are delivered in a high-quality, long lasting, filter box

 

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