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IDAS RGB Type 4 Filter

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IDAS RGB Type 4 Filter

DAS Type 4 RGB +L filter sets are designed for tri-color (BGR) or quad-color (BGR+L) imaging, with special attention to features which address accurate rendition of colors as viewed by the human eye:

  • The bandpasses are designed with astronomical imaging in mind. The passband rolloffs are sufficiently gentle and overlapping to allow intermediate colors (especially the prominent emission nebula lines) to be reproduced so that the elusive goal of "true color" can be approached.
  • The red (R) filter includes some blue (B) band response to match the response of the human eye. This allows violet frequencies to be reproduced correctly as violet (purple). Note that traditional filters which do not include B response in the R filter incorrectly represent violet frequencies as pure blue.
  • The B/G filter cross-over point is set slightly below 500nm to correctly balance the colors in the two OIII emission lines (500.7nm and 495.8nm).

All filters utilize the unique IDAS Ion Gun Assisted Deposition (IGAD*) coating technology for superior coating durability (quartz hardness) and safer cleaning. IGAD coatings also improve temperature and humidity stability of the filter performance, reducing spectrum shifts down to +/-1nm from the +/-3 or 4nm shift of standard coatings.

The unique bandpass arrangements of the IDAS Type 4 filters allow several types of imaging to be done with combinations of filters:


Conventional RGB +L imaging is accomplished by using the IR blocking L filter in conjunction with each of the component color filters (BGR). The Clear filter is used for the L-component so that the focus position is the same as for each of the other components.


Near IR (NIR) "tri-color" (false color) imaging can be done by using an optional IR-pass / visual cutoff filter (R700) in conjunction with the BGR and clear filters. Note that the imaging sensor and optics must also be capable of imaging IR wavelengths.

One application of NIR false color imaging is to planetary imaging. The methane absorption in NIR allows gas giant features to be seen with more contrast, as seen in a Galileo probe view of the Great Red Spot on Jupiter

NIR imaging also allows for better "penetration" of areas dominated by interstellar dust due to the reduced scattering of longer wavelengths. The Trapezium region of M42 is a good example of an area benefitting from NIR imaging.


Full-band False Color imaging can be done by using the RGB and clear filters without additional filtering. This allows IR-capable imaging chips to utilize their full spectral capability. Note that the imaging optics must also be capable of properly imaging IR wavelengths. 

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    Please allow 10 days for your order to arrive. We source products from all over the world to bring you epic offers and the lowest prices. This means sometimes you have to wait a little longer to get your order but it's always worth it!

    Returns are easy, simply contact us for a returns number and send your item to our returns centre for fast processing. We'll get you a replacement or refund in a snap!

    Here are 4 more great reasons to buy from us:

    Returns are easy, simply contact us for a returns number and send your item to our returns centre for fast processing. We'll get you a replacement or refund in a snap!

    In the unlikely event that you find your item cheaper at another online store, just let us know and we'll beat the competitor's pricing hands-down.

    We insist that you love everything you buy from us. If you're unhappy for any reason whatsoever, just let us know and we'll bend over backwards to make things right again.

    Ordering from Scopes Zone is 100% safe and secure so you can rest easy. Your personal details are never shared, sold or rented to anyone either.

    IDAS RGB Type 4 Filter

    DAS Type 4 RGB +L filter sets are designed for tri-color (BGR) or quad-color (BGR+L) imaging, with special attention to features which address accurate rendition of colors as viewed by the human eye:

    • The bandpasses are designed with astronomical imaging in mind. The passband rolloffs are sufficiently gentle and overlapping to allow intermediate colors (especially the prominent emission nebula lines) to be reproduced so that the elusive goal of "true color" can be approached.
    • The red (R) filter includes some blue (B) band response to match the response of the human eye. This allows violet frequencies to be reproduced correctly as violet (purple). Note that traditional filters which do not include B response in the R filter incorrectly represent violet frequencies as pure blue.
    • The B/G filter cross-over point is set slightly below 500nm to correctly balance the colors in the two OIII emission lines (500.7nm and 495.8nm).

    All filters utilize the unique IDAS Ion Gun Assisted Deposition (IGAD*) coating technology for superior coating durability (quartz hardness) and safer cleaning. IGAD coatings also improve temperature and humidity stability of the filter performance, reducing spectrum shifts down to +/-1nm from the +/-3 or 4nm shift of standard coatings.

    The unique bandpass arrangements of the IDAS Type 4 filters allow several types of imaging to be done with combinations of filters:


    Conventional RGB +L imaging is accomplished by using the IR blocking L filter in conjunction with each of the component color filters (BGR). The Clear filter is used for the L-component so that the focus position is the same as for each of the other components.


    Near IR (NIR) "tri-color" (false color) imaging can be done by using an optional IR-pass / visual cutoff filter (R700) in conjunction with the BGR and clear filters. Note that the imaging sensor and optics must also be capable of imaging IR wavelengths.

    One application of NIR false color imaging is to planetary imaging. The methane absorption in NIR allows gas giant features to be seen with more contrast, as seen in a Galileo probe view of the Great Red Spot on Jupiter

    NIR imaging also allows for better "penetration" of areas dominated by interstellar dust due to the reduced scattering of longer wavelengths. The Trapezium region of M42 is a good example of an area benefitting from NIR imaging.


    Full-band False Color imaging can be done by using the RGB and clear filters without additional filtering. This allows IR-capable imaging chips to utilize their full spectral capability. Note that the imaging optics must also be capable of properly imaging IR wavelengths. 

      Shipping
       

         

      Please allow 10 days for your order to arrive. We source products from all over the world to bring you epic offers and the lowest prices. This means sometimes you have to wait a little longer to get your order but it's always worth it!

      Returns are easy, simply contact us for a returns number and send your item to our returns centre for fast processing. We'll get you a replacement or refund in a snap!

      Here are 4 more great reasons to buy from us:

      Returns are easy, simply contact us for a returns number and send your item to our returns centre for fast processing. We'll get you a replacement or refund in a snap!

      In the unlikely event that you find your item cheaper at another online store, just let us know and we'll beat the competitor's pricing hands-down.

      We insist that you love everything you buy from us. If you're unhappy for any reason whatsoever, just let us know and we'll bend over backwards to make things right again.

      Ordering from Scopes Zone is 100% safe and secure so you can rest easy. Your personal details are never shared, sold or rented to anyone either.

      IDAS RGB Type 4 Filter

      $450.00

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