You could take it to an astro shop or post a photo here to check that its a proper filter. Then, regarding the scratch, if you hold the filter up to the sun and can't see any bright spots or pinholes it's fine to use. If you ultimately decide not to use the fitler, don't throw it away as the cell can be used to mount Baader solar film in after removing the glass.
Quote:
Originally Posted by Dazzler
all good tips guys. I thought there would be a simple answer.
On the safety tips I am going to heed all of your advice and think I will pass on the current filter as there is nothing on it or the box for me to confirm exactly what it is.
There is also a small scratch on the inside of the glass so I think it is just not worth the risk.
Thanks again!
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