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moon filter question

  • 20-04-2011 12:29am
    #1
    s3bl3x
    Registered Users, Registered Users 2 Posts: 35 ✭


    Hi all,

    I have a very stupid filter question here.

    I have just taken delivery of my Celestron AstroMaster 130.

    When i eventually the moon i became fixated for ages. Absolutely amazing!!!!

    Anyway.... (stupid question time) how do i use the moon filter??!?!?! where do i fit it to?!?!?!

    Thanks in advance!


Comments

  • #2
    Plug
    Registered Users, Registered Users 2 Posts: 9,248 ✭✭✭Plug


    You fit it into the back of the eye piece. It screws in.


  • #3
    s3bl3x
    Registered Users, Registered Users 2 Posts: 35 ✭s3bl3x


    Plug wrote: »
    You fit it into the back of the eye piece. It screws in.

    D'OH!!!!

    Thanks for the reply plug.... Not easy to figure these things out at 2am in the pitch black :-/


  • #4
    backboiler
    Registered Users, Registered Users 2 Posts: 368 ✭✭backboiler


    I don't know if they have a Sun filter in there too but if there is and it's an eyepiece type too, throw it away. For Sun viewing you need to cover the big end of the telescope with filter material so that the light doesn't enter the lenses at all. What can happen with the eyepiece-based filters is that the intense Sunlight is focussed onto it (as telescopes do!), the filter heats up there since it's absorbing the energy and the resulting hot spot causes the filter to crack, letting the light through to your poor, unsuspecting eyeball. Instant new blind spot for you.


  • #5
    s3bl3x
    Registered Users, Registered Users 2 Posts: 35 ✭s3bl3x


    backboiler wrote: »
    I don't know if they have a Sun filter in there too but if there is and it's an eyepiece type too, throw it away. For Sun viewing you need to cover the big end of the telescope with filter material so that the light doesn't enter the lenses at all. What can happen with the eyepiece-based filters is that the intense Sunlight is focussed onto it (as telescopes do!), the filter heats up there since it's absorbing the energy and the resulting hot spot causes the filter to crack, letting the light through to your poor, unsuspecting eyeball. Instant new blind spot for you.

    Thanks backboiler.

    No sun filter with it... I suspect one too many court cases over that one.


  • #6
    Popoutman
    Registered Users, Registered Users 2 Posts: 1,363 ✭✭✭Popoutman


    Most modern filters are threaded with a male thread on one side of the filter, and this matches with a female threading inside the eyepiece barrel (the bit that goes into the scope itself).
    The moon filter does help to make it more comfortable to view the moon's surface, especially when nearer to Full.
    Trivia: The surface of the moon is pretty much the same colour and brightness as newly-laid sunlit tarmac - gives you an idea of just how much difference our eyes can see between day and night.


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