Is the blocking filter necessary?

Frankenscope? Let's see it!***be advised that NOTHING in this forum has been safety tested and you are reading and using these posts at your own peril. blah, blah, blah... dont mess around with your eyesight when it comes to solar astronomy. Use appropriate filtration at all times...
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NightPhotographer
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Is the blocking filter necessary?

Post by NightPhotographer » Thu May 12, 2016 3:16 pm

Hello

I want to get a Lunt H-Alpha filter for solar imaging. Since I am not going to use my telescope for observing, I'm not sure if I need to buy the blocking filter as well. Is the blocking filter only a safety measure for solar observation?

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Merlin66
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Re: Is the blocking filter necessary?

Post by Merlin66 » Thu May 12, 2016 4:29 pm

<name?>,
The H alpha filter system is a combination of an ERF, an etalon and a blocking filter.
It needs all the elements to function. You definitely need both the front Lunt H alpha filter element plus the rear blocking filter for both visual and imaging.
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marktownley
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Re: Is the blocking filter necessary?

Post by marktownley » Thu May 12, 2016 5:49 pm

Yes you do need a blocking filter.
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http://brierleyhillsolar.blogspot.co.uk/
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