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Sep 4, 2017 at 21:45 comment added JerryTheC ...and the Baader solar film is also guarenteed to block dangerous UV / IR wavelengths by a similar factor; that isn't necessarily true for normal ND filters. If you're observing directly, then go for known safe filters. If you're using an electronic viewfinder, at worst you'll trash the sensor; with an optical viewfinder you could trash your eye - so it's not worth the risk.
Jan 25, 2016 at 4:01 comment added scottbb If the sun is more than 10° – 15° above the horizon, this is potentially dangerous advice. Baader filters are around 17 stops (100,000x reduction), and are safe for direct viewing. You would need to stack 2 ND400 filters to get similar safe reduction.
Jun 7, 2012 at 1:38 history edited Itai CC BY-SA 3.0
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Oct 17, 2010 at 16:10 history edited Alan CC BY-SA 2.5
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Oct 17, 2010 at 2:25 history answered Itai CC BY-SA 2.5