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    Default How to understand defective Baader Astrosolar Film?



    Hi guys,

    I am preparing for venus transit, beside simple sunspot observation. Ordered Baader Astrosolar film from Agenaastro, and recieved today which was well packaged. After making a cell for my small refractor, checked for defects with halogen table lamp. I saw some small dots on film although I paid attention to not harm/strech film during handling/cutting. Discarded that part and before cutting a piece of film out of my film sheet, checked whole film with lamp and there were many dots all over, spread randomly on 8" sheet. It seems no physical holes or dents, so it should be about coatings.

    Since never used solar filter I am not sure if said pinholes are those dots. I am concerned about safety of film and can't risk using it.

    So when hold to bright light, is that normal to have such small dots or i got a whole defective sheet of astrosolar film?

    Clear skies
    Last edited by tkeles; 01-27-2012 at 08:55 PM.

  2. #2
    Talond's Avatar
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    Default

    I look forward to hearing the answer to this also since I am going to order the baader film.

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    Default

    me too......
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    Default

    A simple Google search brought this result from Astronomics:
    Thousand Oaks white light solar filters

    "Pinholes and minor surface scratches are common in vacuum-deposited metallic solar filter coatings. They do not let in enough extra light to cause a visual danger or scope-heating problem, and are no cause for alarm. All filters are tested by the manufacturer for safety before shipment. A “bright” pinhole may cause minor ghosting due to scattered light. If this is seen while observing, the pinhole(s) should be covered on the inside of the filter (the coated side) with a fine point black felt tip marker, a small drop of paint, or a small dab of typewriter white-out. There is no optical danger if small pinholes or scratches are present, and the touch up procedure will not lessen the optical performance. "
    Matthew Ota
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  5. The Following 4 Users Say Thank You to matthewota For This Useful Post:

    kbeverage (01-29-2012),sxinias (01-29-2012),tkeles (01-29-2012),treewood83 (04-12-2012)

 

 

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