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  1. #1
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    Default Filters for Multiple Star viewing?



    So I've just gotten into multiple star viewing recently and have been wondering about something.

    Would it be easier to split a double star or a multiple star if you used a filter (maybe a moon filter)? I'm thinking it might take away some of the brightness of the stars so you could split them easier.

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    -Uncle Peter
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  2. #2
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    Default

    I think that's a reasonable assumption. A broadband/"light pollution" filter may help some as well by cutting down a little on the glare of the primary while improving contrast for the secondary (assuming they're of substantially different magnitudes).

    You might also look into constructing an occulting eyepiece for those really stubborn ones: Occulting Eyepiece, observing Phobos and Deimos

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  4. #3
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  6. #4
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    Default

    Thanks for that link skaven.

    So basically an occulting eyepiece is a normal eyepiece with a piece of material inside of it that obstructs part of the eyepiece?
    -Uncle Peter
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    Default

    Hi Uncle Peter. I haven't done any doubles for awhile but I remember reading somewhere about using half of an adjustable polarizing filter for certain situations. I really can't remember the details now. Also I think there was some testing using green and minus voilet filters. If I remember correctly it helped but I've never tried it myself. I also read somewhere where someone claimed they could see a dim B star if they positioned the brighter A star just off the eyepiece. Of course you have to know what position the B is in relation to the A. Haven't tried that either. Guess that would be considered looking at singles or half doubles. Anyway I always enjoyed viewing doubles but got away from it after I got the Mallincam. Have fun!!! Len
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  9. #6
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    Default

    Thanks Len. I've heard of that method where you position the brighter star out of the FOV. It sounds like a good idea and definitely one to try.
    -Uncle Peter
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  10. #7
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    The occulting eyepiece trick is basically the same as positioning the brighter star outside the FOV, the main difference being that you can keep the dimmer star near the optical axis, which improves clarity and makes it more comfortable to view.

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  12. #8
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    Default

    The occulting eyepiece would work better, at least for me, since I have a SCT, and any light near the edges of the FOV gets distorted.
    -Uncle Peter
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    Hi, Peter

    I'll try out the variable polarizing filter trick next time out.

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  15. #10
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    Quote Originally Posted by astrogeoguy View Post
    Hi, Peter

    I'll try out the variable polarizing filter trick next time out.
    Please let me know how it goes. I've always wondered if it would work. Thanks!
    -Uncle Peter
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