Skip to content
Baader Photometric SLOAN/SDSS y' Individual Filter
Baader Photometric SLOAN/SDSS y' Individual Filter

Baader Photometric SLOAN/SDSS y' Individual Filter

by Baader Planetarium
SKU BAA-2961700Y
CA$206.00 - CA$1,017.00
CA$206.00
CA$206.00 - CA$1,017.00
CA$206.00
Price Match Policy!
  • Conforms to the SLOAN/SDSS y' photometric standard
  • Designed for scientific magnitude measurements
  • Ideal for variable star and exoplanet transit research
  • Available in multiple mounted and unmounted sizes
  • Features planeoptically polished surfaces for maximum sharpness
Backordered
Request Stock Alert
Availability Info
Qualifies for FREE Shipping in Canada on orders over $500.
  • Description
  • FAQ
  • Specifications
  • In the Box
  • Downloads
  • Warranty

  • Baader Photometric SLOAN/SDSS y' Individual Filter

    The Baader Photometric SLOAN/SDSS y' Individual Filter is a specialized optical component designed for rigorous scientific imaging and data collection. This filter precisely isolates the y'-band wavelength range as defined by the Sloan Digital Sky Survey, enabling astronomers to capture accurate, repeatable brightness measurements for astrophysical research. Its construction ensures the optical integrity required for serious photometry, from university-level projects to advanced amateur variable star observing programs.

    The SLOAN/SDSS y' Bandpass for Scientific Imaging

    This filter is not intended for general visual observation or aesthetic color imaging; its sole purpose is instrumental measurement. By conforming to the standardized SLOAN/SDSS system, your data becomes directly comparable to professional survey results and other observers' work worldwide. The y'-band is particularly useful for studying cool stars, brown dwarfs, and distant, redshifted objects.

    • Planeoptically Polished Substrate: Each filter is polished to an exacting standard, preventing any degradation of your telescope's optical resolution. This ensures that point sources remain sharp, which is critical for accurate magnitude extraction from crowded star fields.
    • Multi-Layer Dielectric Coatings: Advanced coatings provide a hard, scratch-resistant surface while ensuring high transmission within the target bandpass and deep rejection of out-of-band light. This maximizes signal-to-noise ratio for faint targets.
    • Homofocal Design: When used with other Baader photometric filters, the y' filter is designed to be homofocal, minimizing the need to refocus when switching between filters during an imaging sequence.

  • What is the primary use of the Baader Photometric SLOAN/SDSS y' filter?

    The primary use of the Baader SLOAN/SDSS y' filter is for scientific photometry. This involves precisely measuring the brightness of celestial objects like variable stars, asteroids, supernovae, and transiting exoplanets. It is designed to conform to the Sloan Digital Sky Survey (SDSS) filter system, ensuring your measurements are standardized and comparable to professional data.

    Is the Baader SLOAN/SDSS y' filter good for visual observing or regular color astrophotography?

    No, this is a highly specialized scientific filter. Its narrow, specific bandpass is designed for measurement, not for creating visually pleasing or "true-color" images. For general deep-sky imaging, you would use LRGB or narrowband filters. For visual use, this filter would produce a dim, oddly colored image with little aesthetic value.

    How would I use the Baader y' filter to study an exoplanet transit around a star like TRAPPIST-1?

    To study an exoplanet transit, you would use a monochrome camera and take a continuous series of images of the host star (like the red dwarf TRAPPIST-1) through the Baader y' filter before, during, and after the predicted transit time. The y'-band is effective for red dwarfs. By measuring the star's brightness in each frame, you can plot a light curve showing the slight dip in brightness as the planet passes in front, allowing you to confirm the transit and measure its depth.

    Can I use the Baader SLOAN/SDSS y' filter to create a light curve of an asteroid like 4 Vesta?

    Yes, absolutely. You would image the asteroid 4 Vesta repeatedly over several hours using the Baader y' filter and a monochrome camera. By measuring Vesta's brightness relative to nearby, non-variable field stars in each image, you can plot its change in magnitude over time. This light curve reveals the asteroid's rotation period and can provide clues about its shape.

    What makes this Baader filter "photometric"?

    A "photometric" filter has several key characteristics:

    • Standardized Bandpass: It accurately reproduces a specific bandpass from a recognized system, in this case, the SLOAN/SDSS y'-band.
    • Excellent Transmission: It allows a very high percentage of light within that bandpass to reach the sensor.
    • Strong Out-of-Band Blocking: It aggressively rejects all wavelengths outside the specified bandpass.
    • Optical Quality: The filter substrate is planeoptically polished so it does not distort the image.
    These features ensure that brightness measurements are accurate, repeatable, and comparable between different observers and instruments.

    Why are there so many size options for the Baader Photometric y' filter?

    The different sizes accommodate the vast range of astronomical equipment.

    • 1.25" and 2" Mounted: These are for standard eyepiece-filter wheels and filter drawers.
    • 31mm and 36mm Unmounted: These are common sizes for filter wheels used with smaller-format astronomy cameras.
    • 50mm Round, 50x50mm, 65x65mm, and 100x100mm Square: These larger unmounted filters are for filter wheels designed for cameras with large full-frame or medium-format sensors, preventing vignetting on wide fields of view.
  • Filter Type Photometric SLOAN/SDSS y'
    Available Sizes 1.25" Mounted, 2" Mounted, 31mm Unmounted, 36mm Unmounted, 50mm Round Unmounted, 50x50mm Square, 65x65mm Square, 100x100mm Square
    Net weight (kg) 0.01 (1.25" Round Mounted, 2" Round Mounted, 50mm Round Unmounted)
    0.02 (50x50mm Square Filter)
    0.03 (65x65mm Square Filter)
    0.08 (100x100mm Square Filter)
    Filter size 1.25 inch (1.25" Round Mounted)
    2 inch (2" Round Mounted)
    36 mm (36mm Round Unmounted)
    50.4 mm (50mm Round Unmounted)
    50 x 50 mm (50x50mm Square Filter)
    65 x 65 mm (65x65mm Square Filter)
    100 x 100 mm (100x100mm Square Filter)
    Filter shape round (1.25" Round Mounted, 2" Round Mounted, 36mm Round Unmounted, 50mm Round Unmounted)
    square (50x50mm Square Filter, 65x65mm Square Filter, 100x100mm Square Filter)
    Single or Set? Single Filter
    Filter mounted Mounted (LPFC 6mm) (1.25" Round Mounted, 2" Round Mounted)
    Unmounted (36mm Round Unmounted, 50mm Round Unmounted, 50x50mm Square Filter, 65x65mm Square Filter, 100x100mm Square Filter)
    Filter Usage SLOAN, CMOS, CCD
    Special Features Life-Coat™ Warranty
    Filter Thickness (without cell) 2 mm (1.25" Round Mounted, 2" Round Mounted, 36mm Round Unmounted)
    3 mm (50mm Round Unmounted, 50x50mm Square Filter, 65x65mm Square Filter, 100x100mm Square Filter)
    CWL (Central Wavelength) SLOAN-y'
    Transmission Range Transmission according to SLOAN-Specification
    AR-Coating Reflex-Blocker™ hard coated, planeoptically polished
    Suitable for f/ratio f/15 to f/1.8

    This product is a single filter. No additional accessories are included.

  • Baader Planetarium Warranty