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Thread: diy h alpha

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    Default diy h alpha



    Hi everyone,
    first of all, i know that this is probably a bad idea and most likely wouldn't work but i want to get your guys' input so the idea can stop rattling around in my head. so the idea is for a diy h alpha(which sounds scary just saying it)... i was thinking of stacking an ir/uv cut and a polarizer to the bottom of the h alpha and then a moon filter on the bottom of the ep. with all of those filters would the sun still be too powerful or could that be a feasible diy h alpha? also if just those wouldn't work, would an h alpha alone (with maybe the ir cut) work with the nd 3.8 solar film?

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    Default Re: diy h alpha

    Personally I don't know how that would work out but I would stay away from made up solar filters. Your eye sight isn't worth risking. I would just stick to manufactured and tested solar filters. You never want to use an eyepiece filter of any kind. The heat that would be created in the eyepiece would be very dangerous and cause eye damage not to mention the telescope optics. We would be talking irreparable eye damage. If you have to pay hundreds of dollars for an HA filter or more for a solar scope, do that. Anything else is not worth the risk.
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    Default Re: diy h alpha

    Don't even think about a DIY solar filter unless it includes a solar filter over the telescope front aperture that is made specifically for solar viewing. You can make a solar filter out of Baader or other similar solar film, but nothing else.

    And putting your filter(s) homemade or otherwise on the end of the eyepiece is asking to be struck blind, literally. Without an energy-rejecting filter on the front of the scope, the bottom of the eyepiece is the place in the scope where the maximum of energy is concentrated in the minimum space. The filter on the eyepiece will crack from the heat, just about the time you are putting your eye to it.

    This is an extremely dangerous idea. Don't try it.

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    Default Re: diy h alpha

    ok, that's the kind of response i was expecting lol... but for the sake of argument, wouldn't the ir cut help with the heat? also would the astrosolar film made for photo(nd 3.8 i think) work at all with a nebula h alpha? i already know the nd 5 doesn't work but i also know that baader's CaK filter needs the photo film... would the lower nd rating let enough light through to show some h alpha features?
    karimooo likes this.

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    Default Re: diy h alpha

    I'd say no. You really don't want to let the naked sun hit your primary mirror. It would probably cook everything inside your scope. So your stacked up eyepiece filters are a bad idea. As for using solar film with an H alpha eyepiece filter, that isn't going to work either. When you put a full aperture solar filter on the end of your telescope , I think you are basically blocking all the wavelengths of light that would be filtered through the H-alpha eyepiece filter. So none of that light will even reach your eyepiece filter. So you still wouldn't be able to see prominences or what not. I could be wrong on that, but I think I read that somewhere. That is why solar gear is so expensive. You'll need the $3000 filter or a $700 solar scope if you wanna see the good stuff. I don't think there is any work around.

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    Default Re: diy h alpha

    I can not answer your questions because I do not have the background or knowledge in HA etalons or filters . I am also a big DIY guy but some things are better left to the experts and this in my opinion is one of them .
    I would never risk my eyesight to try to save a few dollars , my advice would be to be patient and put the dollars you would spend experimenting towards a purpose built HA scope . They are expensive but worth it and you will be assured you are not hurting your eyes .
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    Default Re: diy h alpha

    right, i understand the blocking of all the wavelengths, hence the lower nd for photo(it would let more light through) but i don't know if that would still be enough light to see any features at all. I know that without a proper h alpha i will NEVER be able to see all the prominences and flares, etc like a purpose built scope would.

    thanks guys

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    Default

    Not sure whether the solar film blocks h-alpha or not - but even if it doesn't (which seems fairly likely), and you've cut the intensity down to a safe level, the CCD imaging H-alpha filters have far too wide a band pass to pick out the details - solar scopes use specialised etalons with a band pass of around 1 angstrom or less - about half that in the better ones - and an angstrom is 0.1 of a nanometre, while typical CCD filters have a band pass around 5-10nm, so they're about fifty to a hundred times as wide as the solar scope ones - and the solar scope ones are tunable so you can tweak things to pick out the details you want to look at.

    If it was that simple, solar scopes would be a lot cheaper .

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    Default Re: diy h alpha

    thanks, did not know that there was that huge of a difference between h alpha filters. done with that silly notion

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    Default

    It's not silly, it's just unlikely to work - actually, since I have both a solar filter and an h-alpha CCD filter, I might give it a try next time I'm photographing the sun - just to see if it picks anything out at all

 

 
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