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Baader Planetarium FCCT Filter – UV/IR-Cut / L-Filter 2" unmounted (Ø 47,4 mm) – CMOS-optimized
Baader Planetarium UV/IR-Cut / L-Filter – CMOS-optimized
Baader Planetarium UV/IR-Cut / L-Filter – CMOS-optimized
Baader Planetarium UV/IR-Cut / L-Filter – CMOS-optimized
Baader Planetarium Baader UV/IR-Cut / L-Filter 31mm – CMOS-optimiert
Baader Planetarium UV/IR-Cut / L-Filter – CMOS-optimized
Baader Planetarium UV/IR-Cut / L-Filter – CMOS-optimized
Baader Planetarium Baader UV/IR-Cut / L-Filter 31mm – CMOS-optimiert
Baader Planetarium UV/IR-Cut / L-Filter – CMOS-optimized
Baader Planetarium UV/IR-Cut / L-Filter – CMOS-optimized
Baader Planetarium Baader UV/IR-Cut / L-Filter 31mm – CMOS-optimiert
Baader Planetarium UV/IR-Cut / L-Filter – CMOS-optimized
Baader Planetarium UV/IR-Cut / L-Filter – CMOS-optimized
Baader Planetarium Baader UV/IR-Cut / L-Filter 50x50mm – CMOS-Optimized
Baader Planetarium UV/IR-Cut / L-Filter – CMOS-optimized
Baader Planetarium UV/IR-Cut / L-Filter – CMOS-optimized
Baader Planetarium Baader UV/IR-Cut / L-Filter 65x65mm – CMOS-Optimized
Baader Planetarium UV/IR-Cut / L-Filter – CMOS-optimized
Baader Planetarium UV/IR-Cut / L-Filter – CMOS-optimized
Baader Planetarium FCCT Filter – UV/IR-Cut / L-Filter 2" unmounted (Ø 47,4 mm) – CMOS-optimized
Baader Planetarium Baader UV/IR-Cut / L-Filter 31mm – CMOS-optimiert
Baader Planetarium Baader UV/IR-Cut / L-Filter 31mm – CMOS-optimiert
Baader Planetarium Baader UV/IR-Cut / L-Filter 31mm – CMOS-optimiert
Baader Planetarium Baader UV/IR-Cut / L-Filter 50x50mm – CMOS-Optimized
Baader Planetarium Baader UV/IR-Cut / L-Filter 65x65mm – CMOS-Optimized

Baader Planetarium UV/IR-Cut / L-Filter – CMOS-optimized

par Baader Planetarium
UGC BAA-2961573U
CA$101.00 - CA$357.00
CA$136.00
CA$101.00 - CA$357.00
CA$136.00
Égalisation de prix!
  • Serves as a high-transmission Luminance (L) filter
  • Provides complete Ultraviolet (UV) and Infrared (IR) blocking
  • Engineered with CMOS-optimized anti-reflection coatings
  • Available as 31, 36, 47.4 & 50.4 mm round or 50x50 & 65x65 mm square unmounted filters
  • For compatible filter wheels and drawers, and the Baader FCCT (Filter Changer & Camera Tilter)
En rupture temporaire
Alerte de retour en stock
Info disponibilité
Admissible à la livraison GRATUITE au Canada pour les commandes de plus de 500$.
  • Description
  • FAQ
  • Specifications
  • In the Box
  • Downloads
  • Warranty

  • UV/IR-Cut / L-Filter – CMOS-optimized

    The Baader UV/IR-Cut / L-Filter is a specialized unmounted filter designed to serve as the primary luminance channel for modern CMOS cameras. Available in round (31 mm, 36 mm, 50.4 mm, and 47.4 mm for the Baader FCCT system) and square (50x50 mm and 65x65 mm) formats, this filter provides a clean, high-transmission visible spectrum signal by strictly blocking unwanted ultraviolet and infrared wavelengths that cause bloated stars and soft focus in sensitive imaging systems.

    A True Luminance Filter: Blocking UV/IR for CMOS Sensors

    Modern CMOS sensors are highly sensitive to light outside the visible spectrum, particularly in the near-infrared. Without a proper cut-off filter, this IR sensitivity leads to bloated, unfocused stars and a significant loss of resolution. This filter acts as a true luminance filter, transmitting the desired visible light while completely blocking UV and IR, ensuring your refractor's color correction is maintained and stars remain sharp.

    The "CMOS-optimized" designation refers to its advanced anti-reflection coatings. These are engineered to eliminate the halos and internal reflections that can occur between the flat, reflective surface of a CMOS sensor and the filter glass, keeping bright stars like Vega or Sirius artifact-free.

    Unmounted Round and Square Formats, Including Baader's FCCT System

    Every size is supplied unmounted: 31 mm and 36 mm round filters for filter wheels made for those sizes, 50.4 mm round and 50x50 mm or 65x65 mm square filters for large filter wheels and drawers serving full-frame or larger sensors, and a precise 47.4 mm diameter for direct and secure installation into the Baader FCCT (Filter Changer & Camera Tilter). This unmounted design is critical for minimizing the optical path length, a key factor in achieving focus with complex imaging trains that include correctors or reducers.

    Integrated directly into the FCCT, the 47.4 mm filter becomes a core part of a rigid, tilt-corrected imaging system, while the large round and square sizes keep the light path unobstructed for big sensors. Both avoid the potential for flexure, vignetting, or clearance issues that can arise from stacking traditional threaded filter cells, ensuring a stable and optimized light path from the telescope to your camera sensor.

    Unmounted Filters vs. Standard 2" Mounted Filters: A System Approach

    While a standard 2" mounted filter offers broad compatibility, an unmounted filter provides superior integration in filter wheels, drawers and systems built for its exact size. The primary trade-off is versatility for optimization.

    • Standard 2" Mounted Filter: Housed in a threaded cell (M48x0.75), it can be used in any standard 2" filter wheel or drawer. However, this cell adds several millimeters to the back focus consumption.
    • Baader Unmounted UV/IR-Cut / L-Filter: By removing the housing, it consumes the minimum possible back focus. Each size needs a holder made for it – the 47.4 mm version is designed exclusively for the Baader FCCT, ensuring perfect fit, centering, and parfocality within that system – and no version can be used in standard threaded 2" filter holders.

  • Why is the Baader UV/IR-Cut / L-Filter supplied unmounted?

    The filter is unmounted to integrate directly into filter wheels, drawers and carriers made for its size – including the Baader FCCT (Filter Changer & Camera Tilter) for the 47.4 mm version. This design minimizes the consumption of precious back focus, reduces potential vignetting, and ensures a rigid, stable optical path without the added length and mechanical complexity of a standard threaded filter cell.

    What does "CMOS-optimized" mean for this UV/IR-Cut filter?

    CMOS-optimized means the filter features advanced anti-reflection coatings designed to prevent halos and other artifacts caused by reflections between the filter and the highly reflective surface of a CMOS sensor. This is especially important for maintaining clean, high-contrast images of fields containing bright stars.

    Which size do I need, and will it fit a standard 2" filter wheel?

    All versions are unmounted, so none will fit a standard filter wheel drawer or carousel designed for threaded M48 (2") mounted filters. Choose the size your holder accepts: 31 mm or 36 mm round for wheels made for those diameters, 50.4 mm round or 50x50 mm / 65x65 mm square for large filter wheels and drawers used with full-frame or larger sensors, and 47.4 mm exclusively for the Baader FCCT system.

    If I'm imaging the Pleiades (M45) with a refractor, how does this L-filter help?

    When imaging a reflection nebula like the Pleiades (M45), the bright blue stars are strong sources of UV and IR light. This filter blocks that out-of-band light, which refractors cannot bring to the same focal point as visible light. The result is significantly tighter stars, sharper detail in the faint nebulosity, and the prevention of "blue bloat" that can overwhelm the image.

    How does this filter benefit imaging the Andromeda Galaxy (M31) with an SCT?

    For a broadband target like the Andromeda Galaxy (M31), this filter serves as your high-transmission luminance channel. Its strict UV/IR blocking is critical for SCTs, which often use corrector plates that are not optimized for these wavelengths. By isolating the visible spectrum, you achieve a much sharper luminance frame with better contrast between the galaxy's core, dust lanes, and faint outer arms.

    Is this filter only for monochrome cameras?

    It is designed primarily as a luminance (L) filter for monochrome LRGB imaging. It can also help a color CMOS camera that lacks a sufficient built-in IR-cut filter, where the missing IR blocking leads to a reddish cast and bloated stars. If your color camera already has a UV/IR-cut window in front of the sensor, adding this filter usually brings little additional benefit.

  • 2" Round Unmounted Filter (Ø 47.4mm, FCCT)

    Filter Type UV/IR Cut / Luminance (L)
    Size 2" (Ø 47.4 mm)
    Format Unmounted Round
    System Compatibility Baader FCCT (Filter Changer & Camera Tilter)
    Coatings Anti-Reflection, CMOS-Optimized

    31mm Round Unmounted Filter

    Filter Type UV/IR Cut / Luminance (L)
    Size 31 mm
    Format Unmounted Round
    Coatings Anti-Reflection, CMOS-Optimized
    Primary Use LRGB Astrophotography

    36mm Round Unmounted Filter

    Filter Type UV/IR Cut / Luminance (L)
    Size 36 mm
    Format Unmounted Round
    Coatings Anti-Reflection, CMOS-Optimized
    Primary Use LRGB Astrophotography

    50.4mm Round Unmounted Filter

    Filter Type UV/IR Cut / Luminance (L)
    Size 50.4mm Round, Unmounted
    Coatings Anti-Reflection, CMOS-Optimized
    Primary Use LRGB Astrophotography

    50x50mm Square Filter

    Filter Type Luminance (UV/IR-Cut)
    Size 50 x 50 mm
    Format Unmounted Square
    Coatings CMOS-Optimized, Anti-Reflection

    65x65mm Square Filter

    Filter Type UV/IR Cut / Luminance (L)
    Size 65x65 mm
    Format Unmounted Square
    Coatings CMOS-Optimized, Anti-Reflective
  • Baader Planetarium Warranty