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how safe is Solar Observing through foil like filters ?

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On 25/05/2019 at 06:19, Paz said:

I agree with checking your filter every time. I hold mine up to the sun and check for pinholes by eye every time I put it on the scope.

Also, I check with my hand that it's on and solid every time I put my eye to the eyepiece.

I've also got a film filter for my finder scope which helps but a proper solar finder would be good.

Yes, I do the same with my filter. I hold it up and inspect for any holes. Like you I also use my hand to check filter placement while looking in the EP. 

The only issue ive ever had with a filter was years ago as a youngin with a borrowed glass filter. It had a small unnoticeable crack. Fortunately no eye damage. It definitely made me always check after that.


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I find that the best way to check is to be in a dark place and shine a torch at the back of the filter.

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