Free Shipping On All Orders Over £250 | Call us today on 020 8064 2095

0

Your Cart is Empty

Telescopes
  • TELESCOPES

  • ACCESSORIES

  • FEATURED

  • Binoculars
  • BINOCULARS

  • FEATURED

  • Sporting Optics
  • SPORTING OPTICS

  • FEATURED

  • Brands
  • Shop by price
  • Optolong OIII-CCD 12nm Deep Sky Imaging Filter 2" for CCD Astro Photography

    Estimated Delivery: 1-3 Business days

    .

    Optolong Narrowband OIII filter

    This premium Optolong Narrowband OIII filter is designed for CCD imaging of deep sky objects and nebulosity allowing 12nm bandwidth of light centered on a wavelength of 500nm through, which corresponds to OIII emission lines, and reducing the transmission of certain wavelengths of light, specifically those produced by artificial light including mercury vapor, and both high and low pressure sodium vapor lights and the unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e. skyglow). OIII emits 495.9nm and 500.7nm and it is a blue-green colored filter. Many images of planetary nebulae and supernova remnants are taken only with H-alpha and OIII filters. They show great structural details, but have natural colors, looking like an RGB image.

    Main Use and Performance

    Suitable for visual observation on most emission nebulae, planetary nebulae and supernova remnants. Suitable for viewing on bright nebulae like M42 Orion Nebula in heavy light pollution. Use with a large aperture telescope under clear and dark viewing conditions with good seeing. Due to the fact that this filter will let through a larger amount of light around the OIII emission line, its main purpose is visual observations, however it can also be used with a small telescope for imaging deep sky objects.

    Light pollution filters do not eliminate the effects of light pollution or increase the object’s brightness. In most cases, they increase the contrast between nebula and night sky, not brightening the nebula.

    WARNING:

    Optolong filters are not designed for solar observation. DO NOT LOOK AT THE SUN WITH ANY OPTOLONG FILTER as permanent eye damage will be the result.

    Technical Data

    • Schott substrate material
    • Glass thickness 2.0 mm (1.25”/2”/36mm)
    • Surface Quality: 60/40 (Refer to MIL-O-13830)
    • Fine-optically polished to ensure accurate 1/4 wavefront and < 30 seconds parallelism over both surfaces
    • 90% transmission at major OIII line 495.9nm and 500.7nm
    • Precision off-band blocking, specifically the major emission lines of artificial light pollution (i.e. Na 589nm, Hg 435nm and 578nm).

    Filter Cell

    • Ultra-thin filter cell minimise vignetting by maximising possible clear aperture (clear aperture is 26mm for 1.25” size and 45mm for 2” size)
    • Aerometal Material
    • Precise CNC Machining
    • Sand Blasting Process
    • Black Anodized Finish
    • Extinction Treatment to Prevent Reflection
    • Laser Engraving No Fading

    Available Sizes

    • Standard 1.25” & 2”
    • Round 36mm Unmounted

    Packaging

    • Plastic PP Case
    • Imported High Pressure EVA Case Lining
    • Silver Cardboard Box
    • High Density Sponge Carton Lining

    Optical Coating

    • Multi-layer anti-reflection coating
    • Non-cementing optical substrate coating
    • Electron-beam gun evaporation with Ion-assisted deposition coating technology for durability and resistance to scratching, as well as stability on CWL(central wavelength) no deviation affected by temperature change.
    • Planetary rotation system offers precision and homogeneity of coatings ensuring high value on transmission of pass-band and Optical density of off-band. (Please note, "planetary rotation system" is a type of optical coating process and does not refer to the astronomical system describing the motion of the planets in our solar system.)

    The Major Emission Lines of Nebulae: H-α 656.3nm, H-β486.1nm, OIII 495.9nm, OIII 500.7nm 
    The Major Emission Lines of Artificial Light Pollution: Hg 435.8nm, 546.1nm, 577nm, 578.1nm, Na 598nm, 589.6nm, 615.4nm, 616.1nm

    As authorised dealers for all our products they come with a full manufacturers warranty along with our satisfaction guaranteed, no-questions-asked full refund policy for a full 30 days.

    Please see our returns policy for full details.

    We ship direct from UK warehouses and provide free shipping on all purchases within England, Scotland and Wales (Excluding highlands and Islands)

    We use UPS, DHL, DHL Express, Parcelforce or Royal Mail for all orders.

    Estimated delivery time is displayed at checkout.

    See our shipping policy for more details.

    Should you be outside the free shipping area then please contact us to discuss shipping options as prices vary depending on products and delivery location.

    Got questions? Read through our FAQ list to see if it's answered there! If not, please contact us via this form.

    Customer Reviews

    Be the first to write a review
    0%
    (0)
    0%
    (0)
    0%
    (0)
    0%
    (0)
    0%
    (0)