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Astrodon Photometrics - Sloan Filters

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  1. Astrodon - 50mm dia. Unmounted u Filter

    Astrodon - 50mm dia. Unmounted u Filter

    Astrodon Photometrics - Sloan FiltersThe Sloan Digital Sky Survey (SDSS) filters were  designed by Fukugita et al. (Ast. J., 411/4, April 1996, p ... Learn More
    FREE SHIPPING
    (48 States)
    Model#: U-50R
    $320.00

  2. Astrodon - 1.25 " Mounted I Filter

    Astrodon - 1.25 " Mounted I Filter

    Astrodon Photometrics - Sloan FiltersThe Sloan Digital Sky Survey (SDSS) filters were  designed by Fukugita et al. (Ast. J., 411/4, April 1996, p ... Learn More
    Model#: i-27R
    $150.00

  3. Astrodon - 50mm square Unmounted z Filter

    Astrodon - 50mm square Unmounted z Filter

    Astrodon Photometrics - Sloan FiltersThe Sloan Digital Sky Survey (SDSS) filters were  designed by Fukugita et al. (Ast. J., 411/4, April 1996, p ... Learn More
    FREE SHIPPING
    (48 States)
    Model#: Z-50S
    $390.00

  4. Astrodon - 50mm dia. Unmounted g Filter

    Astrodon - 50mm dia. Unmounted g Filter

    Astrodon Photometrics - Sloan FiltersThe Sloan Digital Sky Survey (SDSS) filters were  designed by Fukugita et al. (Ast. J., 411/4, April 1996, p ... Learn More
    FREE SHIPPING
    (48 States)
    Model#: G-50R
    $320.00

  5. Astrodon - 50mm dia. Unmounted r Filter

    Astrodon - 50mm dia. Unmounted r Filter

    Astrodon Photometrics - Sloan FiltersThe Sloan Digital Sky Survey (SDSS) filters were  designed by Fukugita et al. (Ast. J., 411/4, April 1996, p ... Learn More
    FREE SHIPPING
    (48 States)
    Model#: R-50R
    $320.00

  6. Astrodon - 1.25 " Mounted z Filter

    Astrodon - 1.25 " Mounted z Filter

    Astrodon Photometrics - Sloan FiltersThe Sloan Digital Sky Survey (SDSS) filters were  designed by Fukugita et al. (Ast. J., 411/4, April 1996, p ... Learn More
    Model#: z-27R
    $150.00

  7. Astrodon - 50mm square Unmounted u Filter

    Astrodon - 50mm square Unmounted u Filter

    Astrodon Photometrics - Sloan FiltersThe Sloan Digital Sky Survey (SDSS) filters were  designed by Fukugita et al. (Ast. J., 411/4, April 1996, p ... Learn More
    FREE SHIPPING
    (48 States)
    Model#: U-50S
    $360.00

  8. Astrodon - 50mm dia. Unmounted I Filter

    Astrodon - 50mm dia. Unmounted I Filter

    Astrodon Photometrics - Sloan FiltersThe Sloan Digital Sky Survey (SDSS) filters were  designed by Fukugita et al. (Ast. J., 411/4, April 1996, p ... Learn More
    FREE SHIPPING
    (48 States)
    Model#: I-50R
    $320.00

  9. Astrodon - 1.25 " Mounted u Filter

    Astrodon - 1.25 " Mounted u Filter

    Astrodon Photometrics - Sloan FiltersThe Sloan Digital Sky Survey (SDSS) filters were  designed by Fukugita et al. (Ast. J., 411/4, April 1996, p ... Learn More
    Model#: u-27R
    $175.00

  10. Astrodon - 50mm square Unmounted g Filter

    Astrodon - 50mm square Unmounted g Filter

    Astrodon Photometrics - Sloan FiltersThe Sloan Digital Sky Survey (SDSS) filters were  designed by Fukugita et al. (Ast. J., 411/4, April 1996, p ... Learn More
    FREE SHIPPING
    (48 States)
    Model#: G-50S
    $390.00

  11. Astrodon - 50mm square Unmounted r Filter

    Astrodon - 50mm square Unmounted r Filter

    Achieve the highest transmission possible for fainter objects ... Learn More
    FREE SHIPPING
    (48 States)
    Model#: R-50S
    $360.00

  12. Astrodon - 50mm dia. Unmounted z Filter

    Astrodon - 50mm dia. Unmounted z Filter

    Astrodon Photometrics - Sloan FiltersThe Sloan Digital Sky Survey (SDSS) filters were  designed by Fukugita et al. (Ast. J., 411/4, April 1996, p ... Learn More
    FREE SHIPPING
    (48 States)
    Model#: Z-50R
    $320.00

  13. Astrodon - 1.25 " Mounted g Filter

    Astrodon - 1.25 " Mounted g Filter

    Astrodon Photometrics - Sloan FiltersThe Sloan Digital Sky Survey (SDSS) filters were  designed by Fukugita et al. (Ast. J., 411/4, April 1996, p ... Learn More
    Model#: g-27R
    $150.00

  14. Astrodon - 1.25 " Mounted r Filter

    Astrodon - 1.25 " Mounted r Filter

    Astrodon Photometrics - Sloan FiltersThe Sloan Digital Sky Survey (SDSS) filters were  designed by Fukugita et al. (Ast. J., 411/4, April 1996, p ... Learn More
    Model#: r-27R
    $150.00

  15. Astrodon - 50mm square Unmounted I Filter

    Astrodon - 50mm square Unmounted I Filter

    Astrodon Photometrics - Sloan FiltersThe Sloan Digital Sky Survey (SDSS) filters were  designed by Fukugita et al. (Ast. J., 411/4, April 1996, p ... Learn More
    FREE SHIPPING
    (48 States)
    Model#: I-50S
    $390.00

  16. Astrodon Photometric Sloan 1.25" Mounted Gen2 u' Edge-Blackened Filter

    Astrodon - Photometric Sloan - 1.25" Mounted Gen2 u' Edge-Blackened Filter

    NEW!  Astrodon introduces Generation 2 Sloan filters based upon ongoing input from research organizations.  The changes include

    ...
    Learn More
    Model#: u'2-27R
    $200.00

  17. Astrodon Photometric Sloan 1.25" Mounted Gen2 g' Edge Blackened Filter

    Astrodon - Photometric Sloan - 1.25" Mounted Gen2 r' Edge Blackened Filter

    NEW!  Astrodon introduces Generation 2 Sloan filters based upon ongoing input from research organizations.  The changes include

    ...
    Learn More
    Model#: r'2-27R
    $200.00

  18. Astrodon Photometric Sloan 50mm Unmounted Gen2 i' Edge Blackened Square Filter

    Astrodon - Photometric Sloan - 50mm Unmounted Gen2 i' Edge Blackened Square Filter

    NEW!  Astrodon introduces Generation 2 Sloan filters based upon ongoing input from research organizations.  The changes include

    ...
    Learn More
    FREE SHIPPING
    (48 States)
    Model#: i'2-50S
    $440.00

  19. Astrodon - Photometric Sloan - 50mm Unmounted Gen2 z_s Edge Blackened Filter

    Astrodon - Photometric Sloan - 50mm Unmounted Gen2 z_s Edge Blackened Filter

    NEW!  Astrodon introduces Generation 2 Sloan filters based upon ongoing input from research organizations.  The changes include

    ...
    Learn More
    FREE SHIPPING
    (48 States)
    Model#: z_s2-50R
    $400.00

  20. Astrodon - 1.25" Gen 2 Parfocal UV Blocked Clear Filter

    Astrodon - 1.25" Gen 2 Parfocal UV Blocked Clear Filter

    Astrodon's new improvements of photometric Sloan filters generation 2 feature excellent out of band clocking and other edge-blackended compounds to reduce stray light reflections to assist in CCD imaging.

    ...
    Learn More
    Model#: C2-27R_gen2
    $140.00

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The Sloan Digital Sky Survey (SDSS) filters were designed by Fukugita et al. (Ast. J., 411/4, April 1996, p. 1748-1756) to include five mostly non-overlapping filters covering 300 nm to the sensitivity limit of silicon CCD cameras near 1100 nm. They combined colored glass filters and short-pass dielectric coatings to steepen the low wavelength side of the bandpass. The [O I] skyline at 557.7 nm occurs between the g' and r' filters, and is thus reduced.

 

The SDSS photometric system is the most common filter set used today. The Hubble Space Telescope is equipped with an SDSS set that provides a large reference database for research. Much of photometry up to magnitude 23 will be done in this system with meter-class telescopes. The upcoming large collaborative survey projects (Large Synoptic Survey Telescope - LSST; Panoramic Survey Telescope and Rapid Response System - Pan-Starrs) will also use SDSS filters. The following is a summary of the 50% transmission points of a variety of SDSS filters from the Large Filter Consortium. The new Astrodon Photometrics Sloan set is included for comparison. The Astrodon Photometrics Sloan filters use only dielectric coatings to achieve steep cut-on and cut-offs and peak transmissions in excess of 95%.

  WIYN DES LSST Pan-Starrs Fukugita Astrodon
u'           320/385
g' 402/550 400/550 402/552 402/552 410/551 401/550
r' 560/710 560/710 552/691 552/691 556/695 555/695
i' 700/820 700/850 690/819 691/818 690/814 690/820
z' 830/980 830/1000 818/922 818/922 841/982 820/-

 

To minimize internal reflections that produce halos around brighter stars, the entire bandpass and blocking layers are deposited on one side of the substrate and a high-quality broadband anti-reflective coating is placed on the other side. These filters are parfocal with all Astrodon LRGB and narrowband filters. Specifications:

  • 50% transmission points provided above (+/- 3nm typical)
  • Peak transmission guaranteed > 95% (>90% for u')
  • <0.1%T out-of-band 300 - 1100 nm
  • Striae-free, single fused silica substrates
  • 1/4-wave propagated wavefront prior to coating
  • <0.5 arcminute substrate parallelism
  • 3.000 +/-0.025 mm substrate thickness
  • 1.25" mounted
  • 49.7 mm dia. unmounted
  • 49.7 x 49.7 mm square unmounted