Sloan Filters

Sloan Filters

Sloan Filters

Sloan Digital Sky Survey (SDSS) filters represent a modern approach to astronomical photometry, featuring non-overlapping bands with exceptionally steep spectral transitions.
These precision filters, consisting of U, G, R, I, and Z bands, were instrumental in creating detailed three-dimensional maps of the universe through the SDSS project.
Each filter is manufactured with precise thickness control and anti-reflective coatings to ensure optimal imaging performance and minimal focus shifts during filter changes.
The spectral transmission curves of the Sloan (SDSS) filter set demonstrate their distinctive non-overlapping characteristics, a key advancement over traditional UBVRI systems.
As shown in the graph, each filter band features remarkably sharp cut-on and cut-off transitions: the U filter operates in the ultraviolet around 350nm, the G (green) filter spans approximately 400-550nm, the R (red) filter covers 550-700nm, the I (infrared) filter ranges from 700-850nm, and the Z filter extends beyond 850nm.
A notable feature illustrated in the graph is the high transmission efficiency, with each filter achieving peak transmission values above 80% within their respective bands.
The clean separation between bands, evidenced by the steep transition slopes and minimal overlap, enables more precise photometric measurements and better discrimination between different stellar populations.
This design makes the Sloan filter set particularly effective for large-scale digital sky surveys and precise astronomical measurements where spectral contamination between bands must be minimized.
Sloan Filters body image
  • Non-overlapping spectral bands for cleaner separation
  • Steeper band transitions than traditional UBVRI filters
  • Minimal refocusing requirements between filter changes
  • Anti-reflective coatings for enhanced transmission
  • Precise thickness control
  • Superior transmitted wavefront quality
  • Custom sizing and mounting options available
  • Optimized for modern digital imaging systems
  • Digital sky surveys
  • Galaxy mapping and classification
  • Stellar population studies
  • Cosmological research
  • Large-scale structure studies
  • Quasar detection and analysis
  • Photometric redshift measurements
  • Professional observatories
  • Research institutions
  • Transmitted Wavefront: 1/4 wave or better per 25mm
  • Parallelism: 30 arc seconds or better
  • Surface Quality: 60/40 or better per MIL-C-675
  • Thickness: Precision-controlled to specification
  • AR Coating: Both surfaces
  • Operating Temperature: +23°C (specified)
  • Substrate: High-quality optical glass
  • Standard Sizes: 25mm, 31mm, 50mm diameter and 50mm square
  • Custom specifications available upon request
  • Mounting options customizable

Showing all 10 results

    PART NO.
    DESCRIPTION
    1 - 5 pcs.
    6 - 10 pcs.
    > 10 pcs.
    Stock Status

    SLOAN-G-SDSS-25

    SLOAN G Filter 25mm dia.

    $258.00
    $222.00
    $196.00
    In Stock

    Sloan-I-SDSS-25

    SLOAN I Filter 25mm dia.

    $258.00
    $222.00
    $196.00
    In Stock

    Sloan-R-SDSS-25

    SLOAN R Filter 25mm dia.

    $258.00
    $222.00
    $196.00
    In Stock

    Sloan-U-SDSS-25

    SLOAN U Filter 25mm dia.

    $258.00
    $222.00
    $196.00
    In Stock

    Sloan-Z-SDSS-25

    SLOAN Z Filter 25mm dia.

    $258.00
    $222.00
    $196.00
    In Stock

    SLOAN-G-SDSS-50

    SLOAN G Filter 50mm dia.

    $664.00
    $571.00
    $505.00
    In Stock

    Sloan-I-SDSS-50

    SLOAN I Filter 50mm dia.

    $664.00
    $571.00
    $505.00
    In Stock

    Sloan-R-SDSS-50

    SLOAN R Filter 50mm dia.

    $664.00
    $571.00
    $505.00
    In Stock

    Sloan-U-SDSS-50

    SLOAN U Filter 50mm dia.

    $664.00
    $571.00
    $505.00
    In Stock

    Sloan-Z-SDSS-50

    SLOAN Z Filter 50mm dia.

    $664.00
    $571.00
    $505.00
    In Stock