Home :: OPTICAL ACCESSORIES :: Filters :: Other Contrast & Deepsky Filters :: Optolong OIII-CCD 6.5nm Extra Narrow Band Deep Sky Imaging Filter 36mm Unmounted

Optolong OIII-CCD 6.5nm Extra Narrow Band Deep Sky Imaging Filter 36mm Unmounted

Manufacturers View products from this brand

in In stock (2)
Model
OPT-OIII-CCD-6.5NM-36MM
Weight
0.15 kg
RRP:
£169.00
Our price:
£149.00
12%

including VAT 20.00 % ( £24.83 )
Qty

D3A4-4

This premium Optolong Extra Narrowband OIII-CCD filter is designed for CCD imaging of deep sky objects and nebulosity allowing 6.5nm 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 mainly narrowband imaging of most emission nebulae, planetary nebulae and supernova remnants, but could be also used for visual observations when used with a very large telescope with low focal ratio. Suitable for viewing or imaging of bright nebulae like M42 Orion Nebula in heavy light pollution. When using visually, use it with a very large aperture telescope under clear and dark viewing conditions with good seeing and make sure that your eyes are well adapted to the darkness for the best visual experience.

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, without brightening the nebula.

  • Use with H-alpha 7nm and SII-CCD 6.5nm extra narrowband filters (SHO Set) for tricolor CCD astrophotography
  • Narrowband imaging with SHO set can be done with the Moon up in heavy light pollution, so your equipment is not sitting dormant for several weeks
  • Hubble look of images can be achieved by the combination of H-alpha, OIII-CCD and SII-CCD, such as the famous “Pillars of Creation” (M16 Eagle 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
  • 80% transmission at major OIII line at 500nm
  • Infrared wavelength 700-1100nm cut-off
  • 0.1% transmission of off-band, specifically the major emission lines of artificial light pollution (i.e. Na 589nm, Hg 435nm and 578nm). Transmission of 0.1% is equivalent to OD3(Optical Density), and a high optical density value indicates very low transmission, and low optical density indicates high transmission.

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

  • 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

 

 

: *
: *
: *
 
2" ClickLock CL-M68 Clamp for Zeiss Telescopes
£64.00
£799.00
Cullmann Mundo 525M BLACK Tripod
£116.00
There have been no reviews

Only those who bought this product are allowed to add review
If you've already bought this product, please sign in and add your own review!
 
The website uses cookies to allow us to better understand how the site is used. By continuing to use this site, you consent to this policy. Click to learn more.