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Pegasus Astro LRGB Filter Set - 2"

Pegasus Astro LRGB Filter Set - 2"

by Pegasus Astro
SKU PEG-FLTR-2M-LRGB
CA$470.00 - CA$470.00
CA$470.00
CA$470.00 - CA$470.00
CA$470.00
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  • Complete 4-filter LRGB set for broadband deep-sky imaging
  • Standard 2-inch mounted format for wide compatibility
  • Guaranteed 1/4 wavefront optical precision
  • Parfocal design minimizes refocusing between filter changes
  • Includes Luminance (UV/IR Cut), Red, Green, and Blue filters
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  • Description
  • FAQ
  • Specifications
  • In the Box
  • Warranty

  • 2-inch Mounted Photographic LRGB Filter Set

    This complete 4-filter LRGB set provides the essential components for full-color, broadband deep-sky astrophotography in a standard 2-inch mounted format. Each of the four filters—Luminance, Red, Green, and Blue—is manufactured to a 1/4 wavefront optical standard, ensuring that the precision of your telescope's optics is not compromised. The entire set is parfocal, enabling a streamlined imaging workflow that keeps you focused on capturing data, not chasing focus between exposures.

    1/4 Wavefront Precision for Sharper Stars

    The optical quality of your filters is as critical as your telescope's primary mirror or objective lens. This LRGB filter set is specified to a 1/4 wavefront tolerance over the entire surface, preventing astigmatism or other aberrations that can soften star images. Combined with multilayer anti-reflection coatings, these filters maximize light transmission while suppressing internal reflections, delivering high-contrast views of galaxies, star clusters, and nebulae without distracting halos around bright stars.

    Parfocal Design: Focus Once for All 4 Filters

    In astrophotography, time is precious. This LRGB filter set is designed to be parfocal, meaning there is negligible focus shift when you switch between the Luminance, Red, Green, and Blue filters. This allows you to achieve critical focus once with your Luminance filter and then cycle through the color filters for the rest of your imaging session without constant, time-consuming refocusing. This is especially critical for automated imaging sequences where maintaining sharp focus across all channels is essential for a high-quality final image.

    Broadband LRGB Imaging with Full UV/IR Control

    This set is engineered for classic broadband imaging, the technique used to capture the natural colors of deep-sky objects. The Red, Green, and Blue filters isolate the primary color channels, while the Luminance filter captures fine detail across the visible spectrum. The Luminance filter also functions as a crucial UV/IR cut filter, blocking unwanted infrared and ultraviolet wavelengths that can cause star bloat and reduce sharpness, a common issue in reflector and refractor telescopes that are not perfectly color-corrected outside the visible spectrum.

  • What does "parfocal" mean for this 2-inch LRGB filter set?

    Parfocal means all four filters in the set are manufactured to have the same focal point. In practice, this allows you to achieve sharp focus with one filter (typically Luminance) and then switch to any of the other three (Red, Green, or Blue) without needing to significantly adjust your focuser. This saves a tremendous amount of time and is a key feature for efficient imaging.

    Why is the 1/4 wavefront specification important for these LRGB filters?

    A 1/4 wavefront specification is a measure of optical surface accuracy. It ensures that the filter itself is flat enough not to introduce distortions into the light path. This preserves the sharpness of your telescope's optics, resulting in tighter stars and finer detail in your final astrophotos.

    How will this 2-inch LRGB filter set perform on a galaxy like Andromeda (M31) with an f/5 Newtonian?

    This set is ideal for targets like the Andromeda Galaxy (M31). The Luminance filter will capture the faint outer arms and intricate dust lanes with high detail, while the RGB filters will gather the color data for the galaxy's yellowish core and blue star-forming regions. The multilayer coatings are particularly effective in fast optical systems like an f/5 Newtonian, controlling reflections from bright stars within the galaxy's field of view.

    Can I use this LRGB filter set to image the Orion Nebula (M42)?

    Yes, you can. As a broadband target with strong emission lines, the Orion Nebula (M42) will show its natural colors well with this LRGB set. However, for targets dominated by specific gases (like most emission nebulae), astrophotographers often use narrowband filters (like H-alpha or OIII) to isolate those structures more effectively, especially from light-polluted skies. This LRGB set is the go-to choice for broadband targets like galaxies, reflection nebulae, and star clusters.

    What is the purpose of the UV/IR Cut feature on the Luminance filter?

    Telescope optics, especially refractors and reflectors, often do not bring ultraviolet (UV) and infrared (IR) light to the same focal point as visible light. This can result in bloated, unfocused stars and a soft overall image. The UV/IR Cut function of the Luminance filter blocks these out-of-focus wavelengths, allowing only the visible spectrum to pass through, which results in a significantly sharper, higher-contrast detail channel.

    Are these 2-inch filters compatible with my filter wheel?

    These are standard 2-inch mounted filters, which use M48x0.75 threads. They are compatible with virtually all 2-inch filter wheels and filter drawers on the market that accept this common standard.

  • Filter Type LRGB Set (Luminance, Red, Green, Blue)
    Size 2-inch, mounted
    Threads M48x0.75
    Optical Quality 1/4 Wavefront
    Coatings Multilayer Anti-Reflection
    Parfocal Yes
    Luminance Filter Includes UV/IR Cut

    • 2-inch Luminance (UV/IR Cut) Filter

      × 1

    • 2-inch Red Filter

      × 1

    • 2-inch Green Filter

      × 1

    • 2-inch Blue Filter

      × 1

    • Protective Storage Case

      × 1

  • 2-Year Manufacturer Warranty