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Thread: Interested in solar filter

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    Default Re: Interested in solar filter



    My DIY Baader film filter.



    Scott
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    Default Re: Interested in solar filter

    I do not think they make a stand alone Ha filter that can be used with a reflector.
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    Default

    Quote Originally Posted by DM1975 View Post
    So could I do that with a 2" H alpha filter you think?
    No. That'd probably be fried eyeball time...
    The 2" (and 1.25") h alpha filters are for DSO imaging. They DO NOT cut sunlight down to safe levels - they're intended for (imaging) use on emission nebulae. You could use one on an eyepiece together with solar film on the front of the scope - but you'd most likely still be disappointed - solar scopes use tunable etalons with a band pass around 0.5-1.0 angstroms (0.05 to 0.1nm) while the DSO filters have a band pass around 5-10nm or so - about 50-100 times too big .

    You can get solar h-alpha add-on units but they tend to cost as much (if not more) than the small h-alpha scopes.

    One safety note - if you have a non-solid tube dob, you need to add a shroud round the outside - otherwise, while you're setting up, light can come in through the sides, get focused by the main mirror and melt or ignite things.
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    Default Re: Interested in solar filter

    Thanks, I'll stick with a film filter then and just save up for a sub-angstrom dedicated telescope.
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    Default Re: Interested in solar filter

    Quote Originally Posted by DM1975 View Post
    So could I do that with a 2" H alpha filter you think?
    Don't even think about it. Ha filters are for imaging things like the Horsehead. Do not use one for solar viewing.
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    John (Urban Astronomer)
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