Astronomik Filters OIII 6nm CCD 36mm (63221)

The OIII-CCD filter is perfect for imaging OIII nebulae from both light-polluted and dark observation sites. It significantly enhances the contrast between objects emitting at 501nm and the background, making faint structures more visible. With a narrow bandwidth of 6nm and a high transmission rate of 96%, it blocks all unwanted light from UV to IR, creating an exceptionally dark background. This makes it ideal for imaging faint objects in dense star fields or under heavy light pollution. The filter is optimized for CCD and CMOS sensors with very low dark current, ensuring optimal performance.

This filter provides perfect blocking of unwanted light, is parfocal with all Astronomik filters, and is resistant to moisture, scratches, and aging. Its optically polished substrate is striae-free and free of residual stresses, ensuring high-quality imaging results. Thanks to MRF coating technology, it can be used on devices with apertures as fast as f/4. When combined with H-alpha-CCD and SII-CCD filters, it enables the creation of false-color emission line images (HSO), similar to those produced by the Hubble Space Telescope, even in heavily light-polluted environments.

For alternative applications, the 12nm line filters are better suited for DSLRs or CCD cameras with higher dark current. They are also advantageous for cameras with built-in guiding chips, as they allow for capturing twice as many stars in an image compared to the 6nm filter.

Specifications

• Capacity:
  • Central wavelength (nm): 501
  • Half-value width (nm): 6
  • Transmission: 96%
  • Mount material: Aluminium
  • Frame: Ring
• Coating of Optical System: MRF
• Filter Size (mm): 36
• General Features:
  • Series: OIII 6nm
  • Type: Filters
  • Type of build: Line filter
• Area of Application:
  • Useful for photographs: Yes
  • Galaxies and star clusters: Yes
  • Anti light-pollution: Yes
  • Visually useful: No