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    Default What is the coating?



    Does anybody know what the coating is that EP makers put on there EP's?How about on scopes that have XLT or similar coatings. Just curious. Thanks. Derek.
    name: Derek

    Various scopes and such.

  2. #2
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    Default

    Best grab a coffee and sit doon ( down ! ) afore ya read this.

    There are three major components that make up our StarBright XLT high transmission optical system design:

    1. Unique enhanced multi-layer mirror coatings
    Our mirror coatings are made from precise layers of Aluminum (Al), SiO2 (quartz), TiO2 (Titanium Dioxide), and Si02. Reflectivity is fairly flat across the spectrum, optimizing it for both CCD imaging and visual use.

    2. Multi-layer anti-reflective coatings
    Made from precise layers of MgF2 (Magnesium Fluoride), and HfO2 (Hafnium Dioxide) A rare element costing nearly $2000 per kilogram, Hafnium gives us a wider band pass than Titanium, used in competing coatings.

    3. High Transmission Water White glass
    Celestron Schmidt-Cassegrain optical systems with optional StarBright XLT coatings use Water White glass instead of Soda Lime glass for the corrector lens. Water White glass transmits about 90.5% without anti-reflective coatings. That is 3.5% better transmission than uncoated Soda Lime glass. When Water White glass is used in conjunction with StarBright XLT's anti-reflective coatings, the average transmission reaches 97.4% — an 8% improvement!

    These three components of our StarBright XLT coatings result in one of the finest coatings available. The peak transmission for the systems is 89% at 520 nm. The overall system transmission is 83.5% averaged over the spectrum from 400 to 750 nm.

    From : - http://www.analyticalsci.com/Astrono...ight%20XLT.htm
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    Default

    Thanks for the detailed explanation. That is cool stuff.
    name: Derek

    Various scopes and such.

 

 

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