Astronomik Filters OIII 6nm CCD Clip Canon EOS APS-C (46798)

The OIII-CCD filter is an excellent choice for imaging OIII nebulae, whether observing from light-polluted areas or dark-sky sites. It significantly enhances the contrast between objects emitting at 501nm and the background, making faint structures stand out vividly. With a narrow bandwidth of 6nm and a high transmission rate of 96%, it blocks all unwanted light from UV to IR, resulting in an exceptionally dark background. This makes it particularly effective 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 excellent performance.

This filter provides perfect blocking of unwanted light and is parfocal with all Astronomik filters. It is resistant to moisture, scratches, and aging, with an optically polished substrate that is striae-free and free of residual stresses. 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 ideal for DSLRs or CCD cameras with higher dark current. These filters also work well for cameras with built-in guiding chips, as they typically capture twice as many stars in an image compared to the 6nm filter. Additionally, while most camera lenses can be used with the Clip-Filter system (e.g., Canon EF lenses or third-party lenses like Sigma or Tamron), note that Canon EF-S lenses are not compatible with clip-filters.

Specifications

• Capacity:
  • Transmission: 96%
  • Frame: Clip-Filters
  • Half-value width (nm): 6
  • Central wavelength (nm): 501
• Appropriate for: Canon EOS
• 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