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Orion - Maan- & Planetenfilters

Orion - Lichtpollutie- & Contrast Filters

Orion - Zonnefilters

Baader - Filters

Sky Watcher - Filters

Orion - Maan- & Planetenfilters

Afbeelding Type Prijs


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Orion - Planetary & Lunar Explorer Accessory Kit


  • An affordable and thorough collection of telescope accessories to improve your planetary and lunar views
  • Included Orion Color Filter Set enhances landscape details and cloudy features on the bright visible planet
  • Included Orion 7.5mm Sirius Plossl telescope eyepiece provides a crisp high magnification view, with pleasing 52-deg apparent field-of-view
  • Included Orion Shorty 2x Barlow Lens adds versatility by doubling the magnification of each eyepiece in your collection - makes the included 7.5mm eyepiece provide the magnification of a 3.7mm eyepiece
  • The included Orion Beginning Stargazer's Toolkit provides four popular astronomy tools: Orion StarTarget planisphere, Orion MoonMap 260, Orion Telescope Observer's Guide book, and an Orion RedBeam Mini keychain flashlight

130,00 EUR

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Orion - Color Filter Set 1.25"


  • Handy color planetary telescope eyepiece filters help enhance your view of the planets and Moon, unveiling specific features and enabling you to discern more detail
  • High-grade Schott optical glass is vat-dyed for even color coating, then anti-reflection coated for maximum light throughput
  • Anodized aluminum cells are double-threaded to permit filter stacking for multiple filter use
  • Includes #15 Deep Yellow, #25 Red, #58 Green and #80A Medium Blue color filters
  • Each filter has a metal filter cell and is threaded for use with Orion 1.25" telescope eyepieces and filter-threaded accessories


59,00 EUR

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Orion - Neutral-Density 13% Moon Filter 1.25"


  • The Orion 1.25" 13% Transmission Moon Filter reduces glare so you can see more lunar detail and surface features with your telescope
  • Metal filter cell threads directly into the 1.25" barrel of your telescope eyepiece
  • Especially useful for large aperture telescopes through which the light of the Moon can be extremely overwhelming
  • Telescope eyepiece filter transmits only 13% of the incoming light, boosting contrast and ability to discern detail on the Moon
  • Perfectly neutral color will not alter the natural color of the Moon

23,00 EUR

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In stock


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Orion - Neutral-Density 25% Moon Filter 1.25"


  • A specialty Moon filter especially useful for increasing contrast during waning and waxing crescent phases
  • Allows transmission of 25% of incoming light
  • Reduces bright glare reflected off the Moon and boosts contrast and resolution of lunar surface features
  • Threads directly into Orion 1.25" telescope eyepiece barrels
  • Provides a brighter view than our 13% Moon filter by blocking less light - ideal for use with smaller telescopes


24,00 EUR

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Orion® - Neutral-Density 13% Moon Filter 2"


  • Helps reduce the bright glare of the Moon so you can see more lunar detail and surface features with your telescope
  • 2" Moon filter with metal filter cell construction threads directly into the barrel of a 2" telescope eyepiece
  • Especially useful for large aperture telescopes through which the bright Moon surface can be overwhelming
  • Transmits just 13% of the incoming light to your eye, enhancing your view
  • Neutral filter will not alter the natural color of the Moon in your views

35,00 EUR

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Orion - Mars Filter 1.25"


  • High-performance observational eyepiece filter markedly improves views of Mars
  • Fully-coated Mars filter increases contrast to bring out subtle details on the disc of the red planet
  • When using the Mars filter on a clear, dark evening you'll see polar ice cap detail, subtle mare shadings, duststorm and cloud activity
  • Eyepiece filter dramatically improves views of Mars even in smaller astronomical telescopes
  • Designed to fit 1.25" telescope eyepieces with filter threads. Metal filter cell construction.

55,00 EUR

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Orion - Lichtpollutie- & Contrast Filters

Afbeelding Type Prijs


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Orion - SkyGlow Broadband Light Pollution Filters 1.25"


  • Specialized astrophotography filter designed for deep-sky imaging in light polluted skies with CCD or DSLR cameras
  • The SkyGlow Imaging filter suppresses up to 99% transmission of specific light wavelengths responsible for light pollution
  • Enhances contrast of all types of deep-sky objects: galaxies, nebulas, and star clusters
  • Filter preserves neutral color balance, eliminating need for corrective color processing later
  • Enables longer astrophotographic exposure times without background saturation due to sky glow.

79,00 EUR

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Orion - SkyGlow Broadband Light Pollution Filters 2"


  • Zelfde filter als hierboven maar in diameter 2" (50 mm) 

99,00 EUR

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Orion - Luminance IR CutOff Filter 1.25"


  • IR filter blocks ultraviolet (UV) and infrared (IR) light wavelengths for higher contrast CCD images
  • Advanced coatings applied to the precision polished optical glass minimize in-band reflectionsThe 1.25" anodized aluminum cell threads into the nosepiece of an astrophotography camera or filter wheel
  • This an excellent luminance filter for LRGB astrophotography
  • Attaches easily to any 1.25" astrophotography accessory

52,00 EUR

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In stock


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Orion® - H-Alfa Extra Narrowband Filter 1.25"


  • Orion's Hydrogen-Beta eyepiece filter makes it possible to view the elusive Horsehead, California, and Cocoon Nebulas in dark skies
  • Selective band-pass filter transmits only the hydrogen-beta light these faint nebulas emit
  • Filter allows you to observe targets that are considered trophies of visual astronomy
  • Best used with a moderate to large aperture telescope and clear, dark skies
  • Metal filter cell threaded to fit 1.25" eyepieces and threaded diagonal barrels

172,00 EUR

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In stock


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Orion - V-Block Anti-Fringe 1.25


  • Filter voor visueel gebruik tegen gekleurde halo's rond heldere objecten veroorzaakt door kleurfouten van het objectief.
  • Verbetert de beeldscherpte, de kleurweergave, het contract en het scheidend vermogen.
  • Zeer aan te raden bij acromatische refractors met grote openingsverhoudig.

57,00 EUR

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Orion - Dark Frame Imaging Filter 1.25" - NIEUW


  • Capture dark frames quickly to optimize astrophoto quality
  • Easily eliminate camera noise and "hot pixels"
  • Opaque filter blocks all light from imaging camera sensors
  • Allows automated dark frame capture when used with an optional filter wheel or slider
  • Threaded for use with 1.25" camera nosepieces, 1.25" filter wheels, and 1.25" filter sliders

24,00 EUR

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In stock


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Orion - Oxygen-III Extra Narrowband 1.25"


  • Astrophotographic 1.25" filter allows high-contrast imaging even in areas with strong light pollution
  • Filter passes light at 500.7nm wavelength (O-III line) with a bandpass of 7nm for pleasing results
  • Very high 90% transmission of O-III light for sharp astrophotos
  • Filter made from high-grade glass with dichroic interference and antireflection coatings; size 1.25". Metal filter cell construction.
  • Use with S-II and H-alpha extra-narrowband imaging filters for tricolor CCD astrophotography

142,00 EUR

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Orion - Sulfur-II Extra Narrowband 1.25"


  • Sulfur-II astrophotography filter allows high-contrast imaging even in light polluted skies
  • Filter passes light at 672.4nm wavelength (S-II line) with a narrow bandpass of 7nm
  • Very high 90% transmission of S-II light allows stunning astrophotos to be captured in city skies
  • 1.25" astrophotography filter made from high-grade glass with dichroic interference and antireflection coatings. Metal filter cell construction.
  • Use with Orion O-III and H-alpha extra-narrowband imaging filters for tricolor CCD astrophotography

142,00 EUR

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Orion - Multiple 5-Filter Wheel


  • Handy and versatile wheel holds up to five 1.25" filters for visual and/or imaging use
  • A huge time-saver for filtered planetary and lunar observation using different color filters, or for tri-color astrophotography pursuits
  • Holds up to five 1.25" filters, or you can leave one space blank for unfiltered viewing
  • Requires additional 20mm of focus travel - not recommended for use with Dobsonian reflectors
  • Protects installed eyepiece or astrophotography filters from dust, dirt, and impact, and keeps them ready for action

99,00 EUR

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Filter Case 2"


  • Filterdoos uit harde kunststof om uw 2" filters veilig en netjes op te bergen.
  • Filters zijn toch binnen handbereik dankzij handig deksel.
  • Beschermd door kunststof blijft uw materiaal krasvrij.
  • Biedt plaats aan 4 filters.

7,00 EUR

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In stock

Orion - Zonnefilters

Afbeelding Type Prijs


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Orion - Safety Film Solar Filter for 4.5" (11cm)


  • Safe and affordable solar filter lets you use your 4.5" (11 cm) aperture Orion reflector telescope to observe the Sun
  • See sunspots, eclipses, and planetary transits of the Sun safely with your telescope and this filter
  • Made with high quality, streak-free and blister-free Baader Astro Solar Safety Film
  • Displays the Sun in neutral white color, without tinting
  • Designed for use with all brands 11 cm aperture reflector telescopes.

32,00 EUR

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Orion - Safety Film Solar Filter for 6" (15 cm)


  • Safe and affordable solar filter lets you use your 6" (15 cm) aperture  reflector telescope to observe the Sun
  • See sunspots, eclipses, and planetary transits of the Sun safely with your telescope and this filter
  • Made with high quality, streak-free and blister-free Baader Astro Solar Safety Film
  • Displays the Sun in neutral white color, without tinting
  • Designed for use with all brands 15 cm aperture reflector telescopes


47,00 EUR

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Orion - 9.25" (23cm) ID Full Aperture Solar Filter


  • A must-have for safely observing the Sun without damaging your eyes - optical glass filter fits snugly over your telescope's aperture to block 99.9% of incoming sunlight
  • Fits 20cm Schmidt-Cassegrain Telescopes (SCT)
  • Each Orion telescope solar filter is mounted in a foam-lined aluminum cell featuring three equidistant securing thumbscrews, 4x 1/16" thick adhesive foam tabs, and 4x 1/8" thick adhesive foam tabs for customized friction fit to your telescope
  • Filter inside diameter is 23 cm - fits optical tubes with an outer diameter of  22.5cm to 23cm with included shim materials and securing thumbscrews
  • Note: All Orion solar filters are designed for use with an adequate friction fit attachment. Thumbscrews should ONLY be used to keep filter securely in place once a friction fit has been achieved


177,00 EUR

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Baader - Filters

 

Afbeelding Type Prijs


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Baader - Solar Viewer Eclipsbrilletje


  • Een veilig hulpmiddel voor het kijken naar de Zon,  bv. tijdens een gedeeltelijke zonsverduistering.

4,00 EUR

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Baader - AstroSolar Safety Film 200 X 300 mm


  • Kwaliteits-zonnefolie met Optical Density 5.0 voor gebruik van de volle opening van uw telescoop of  verrekijker.
  • De zonnestraling wordt voor 99.999% tegengehouden zodat u op volkomen veilige wijze naar onze eigen ster kunt kijken.
  • Beide zijden zijn voorzien van  High Density coatings voor uniforme lichtreductie, waarbij eventuele microscopische gaatjes in de coating worden geneutraliseerd.
  • Het resultaat is een bijzonder contrast-rijk zonnebeeld met een quasi neutrale kleur. 
  • Enkel voor visuele observaties, niet geschikt voor fotografie.
  • Gepatenteerd en CE goedgekeurd

28,00 EUR

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Baader - AstroSolar Safety Film 1000 X 500 mm


  • Zelfde produkt als hierboven maar met afmetingen 1000 x 500 mm
  • Optical Density: 5.0
  • Enkel voor visuele observaties, niet geschikt voor fotografie.
      

78,00 EUR

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Baader - AstroSolar Photo Film 200 X 300 mm


  • Baader AstroSolar  Fhoto Film voor fotografie van de Zon
  • Enkel voor fotografie, niet geschikt voor visueel waarnemen !
  • Optical Density: 3.8 
  • Gepatenteerd en CE goedgekeurd


38,00 EUR

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Baader - Fringe Killer 31.75 mm - With IR Cut


  • Onderdrukt kleurfouten bij refractors en laat Maan- en planeetdetails beter zien.
  • Onderdrukt licht in het rode deel van het spectrum en het teveel aan storend blauw licht, met beter focuseren als resultaat.
  • Laat details op Maan en planeten beter tot uiting komen.
  • Enkel geschikt voor refractor (lenzen) telescopen! 
  • Klik op de foto voor een vergelijkende test.

 


59,00 EUR

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Baader - Semi-APO Filter


  • Combinatie van de eigenschappen van de Baader-Fringe Killer en het Mond-&Skyglow filter.
  • Geeft bij goedkopere refractoren een correctere kleurweergave waarbij de typische blauwe en rode halo worden vermeden.


82,00 EUR

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Baader - O-III Filter 1.25"


  • De meest gebruikte visuele deepskyfilter.
  • Werkt zeer goed op planetaire nevels en supernovarestanten.

95,00 EUR

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Sky Watcher - Filters

Afbeelding Type Prijs


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Lunar & Planetary 1.25" Filterset


  • Comprises 4 x high quality glass colour filters. 
  • Yellow, Red, Green & Moon/Neutral Density Filters included. 
  • These filters will fit most internally-threaded eyepiece barrels of 1.25"/31.7mm format. 
  • Supplied in attractive foam-lined plastic screw top storage case.

49,00 EUR

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L-RGB CCD Filter Set 1.25"


  • Designed for CCD astrophotography, the set includes Luminance-IR, Red, Green, and Blue dichroic CCD filters.
  • The filters are resistant to humidity and scratching and set into a durable aluminium alloy threaded mounting ring.
  • The red green and blue filters have been developed to closely match the natural colours of stars, planets and emission nebulae, whilst the luminance filter removes damaging haze and ultraviolet.
  • The filters offer light transmission of nearly 100%. Please note the red, green and blue filters are not IR coated.


165,00 EUR

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Clear Sky CCD Filter 1.25"


  • This filter blocks night glow and airglow, sodium and mercury emissions (but not UV or IV).
  • This versatile broadband filter is suitable for all objects, whether you are viewing them with your eyes, or capturing them with your camera.
  • Suitable for visual observations and for CCD photography. 

48,00 EUR

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Light Pollution Filter 1.25"


These contrast-enhancing anodized aluminium, optical glass filters are designed to block out the wavelengths of light emitted by mercury-vapour light and other common causes of light pollution, whilst providing higher transmission at critical hydrogen-alpha and hydrogen-beta lines than competing filters. Bright, light-polluted skies appear much darker, and the contrast between object and sky is improved significantly. This contrast-enhancement effect is particularly apparent on nebulae. Unlike stars, emission nebulae give off light in a very narrow range of wavelengths. These filters allow maximum transmission of the important wavelengths of H-alpha, H-beta and doubly ionized oxygen – the ones most commonly emitted by nebulae. Views of galaxies and star clusters are also enhanced, but to a lesser degree. Also improves contrast on reddish planetary detail. Works well in telescopes of all apertures but is highly recommended for use on smaller telescopes up to 114mm diameter, where conventional filters swallow up too much light. 


29,00 EUR

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Light Pollution Filter 2"


Dezelfde filter als hierboven maar voor oculairen met een 2" (50 mm) vatting.


42,00 EUR

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Deep Sky Filter 1.25"


This filter blocks low and high pressure mercury and sodium vapour lamplight and neon light whilst letting the rest of the visible spectrum through. Excellent for viewing all deep sky objects under the urban sky. Suitable for visual observations and for CCD photography.


59,00 EUR

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O-III Narrowband Filter 1.25"


The O-III narrowband filter is specially designed for the observation of gas and  planetary nebulae.

It distinguishes different contrasts of the wavelengths of light that pass through, giving ideal conditions for the observation of faint super nova remnants and planetary remnants.

The O-III narrow band-pass filter isolates just the two doubly ionized oxygen lines (496 and 501nm) emitted by diffuse, planetary and extremely faint nebulae. O-III filters work ideally with larger aperture telescopes in the 200mm and  larger range. With larger aperture telescopes, observers will have a better opportunity to identify nebulae objects in the deep sky. It can produce near-photographic views of the Veil, Ring, Dumbbell, Orion, plus many other nebulae under dark skies. These Available in two sizes, threaded to fit either standard 1.25” or 2” astronomical eyepieces. Supplied with storage case.  


60,00 EUR

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O-III Narrowband Filter 2"


Dezelfde filter als hierboven maar voor oculairen met een 2" (50 mm) vatting. 


84,00 EUR

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UHC Filter 1.25" (Ultra High Contrast)


The narrowband UHC filter, like the O-III filter, isolates the two doubly ionized oxygen lines (496 and 501nm) in addition to the hydrogen-beta line (486nm) emitted by planetary and most emission nebulae. This filter permits superb views of objects like the Orion, Lagoon, Swan and other extended nebulae. It performs well in smaller aperture instruments owing to its greater light transmission than the O-III, yet still suppresses light pollution well. The UHC filter is the best all-around dark-sky nebula filter. Available in two sizes, threaded to fit either standard 1.25” or 2” astronomical eyepieces. Supplied with storage case.


56,00 EUR

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Hydrogen Alpha CCD Filter


This long-pass filter limits transmission of light with wavelengths longer than 650nm. Whilst suppressing all other polluting lights, the filter allows you to observe emission nebulae with greatly enhanced contrast. Ideal for observing emission nebulae or objects that emit in the H-alpha region. Suitable only for CCD photography.

 


65,00 EUR

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H-Beta Filters 1.25"


This high performance CCD filter transmits only the Hydogen Beta emission line, and therefore is useful for greatly increasing the contrast of objects that glow in the corresponding region of the spectrum, for example the Horsehead, Cocoon and California nebulae.

Available in 1.25" and 2" sizes.

Recommended for capuring H-beta emitting objects using CCD photography under dark skies


60,00 EUR

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UV/IR Cutoff Filter


This UV/IR cut filter blocks UV and IR rays to maintain the color temperature you want, eliminating false colour fringes around bright stars. Offers a 99.9% light transmission rate for bright and clear images. Suitable for visual observations and for CCD photography.


52,00 EUR

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OPTIEK VAN GROOTVEN B.V.B.A.
Opticien-Optometrist 
Kapellestraat 24
2630 Aartselaar - 03 887 73 93 of  0471 68 41 83
info@grootven.be
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