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  1. #1
    ScubaDude's Avatar
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    Default Rainy day telescope project - Bahtinov mask



    I finally got around to making a Bahtinov mask. It's made out of craft foam board. The online mask generator gave me 3.3 millimeter slits, but I don't have the patience (or the eyesight) to cut them that small, so I went with 1/4 inch. Instead of printing the mask, I got out a protractor and compass and drew the mask onto the board. Maybe some day it will stop raining and I'll get to try it out.





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    DaltonSkyGazer (02-10-2011)

  3. #2
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    Looks Great! This is a highly recommended item for all imagers, swear by them!!!! Congrats and Clear Skies to you!!!

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    Jeff Turner


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  4. #3
    Canon Pete's Avatar
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    Default

    Sgt Pepper would be proud of that , looks the business. These are such a simple piece of kit but oh so effective in there use.

    Clear Skies

    Pete
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  5. #4
    jenniferchristine's Avatar
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    Default

    Got to agree with that, I'm not sure how you wear it though.....
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  6. #5
    jimt's Avatar
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    Default

    I have one of those masks that came with my C9.25. My question is how do I attach it to the telescope? It has no screws or tabs. I don't really want to just tape it on while I use it. Any Ideas?

    Nice job on the crafted mask!

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    Now where did I put that clear sky button!

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  7. #6
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    Default

    Jim , there are some that fit on the corrector plate, just placed inside the inner rim usually have a hole in the center to accommodate the secondry holder. Others have have either holes for plastic screws to be inserted ( they then hang the mask by the edge) or tabs .

    Yours sounds like the first one I described, means you need to use finger/fingernails to remove BUT , if it is that type my suggestion would be to adapt some sort of 'grabber' to avoid touching the corrector plate accidently , and possibly leaving a oil skin mark onthe glass.

    Clear Skies

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  8. #7
    jimt's Avatar
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    Default

    Yep that it exactly Pete. I need to do a test fit to make sure it's not going to lie against the glass. Good idea about making a "handle" on it to be able to remove it w/o touching the corrector. It was made for that particular OTA so it shouldn't take much if any modification. Thanks for the input.
    Jim
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    Now where did I put that clear sky button!

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  9. #8
    jenniferchristine's Avatar
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    Default

    I made mine to fit closer to the corrector plate. It works well and the close fit on the centre obstruction means it is not prone to wind or easy dislodging - it has tabs to pull it off.
    It's made out of the back of an A4 office folder jacket
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  10. #9
    KingWookie's Avatar
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    Default

    What does this mask do? Is it for alignment?
    Ryan

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  11. #10
    jenniferchristine's Avatar
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    Default

    When on the scope, it shows diffraction spikes shaped like a cross with a line through it - when you adjust the focus, it moves the line through the cross - when the line perfectly dissects the cross, you are perfectly in focus
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