Quote:
Originally Posted by naskies
For the record... Hoya's NDx400 filter that they claim is safe to shoot the sun with is only a 9 stop filter! In solar film terms, it would be equivalent to a OD2.7...
*** Note: the above is just my personal speculation, I don't actually know what I'm talking about so please be careful 
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This is what their site promotes....
"Photographing solar eclipses and ultra-bright light sources can be extremely dangerous. This filter reduces light values by 9 stops to less than 1/500th of its original intensity and allows safe photography."
They also show a pic of a full sun with sunspots.
http://www.hoyafilter.com/products/hoya/oef-07.html
There is absolutely nothing safe about it, they certainly don't give any intructions on safe use and there is absolutely no way anybody should be looking through the view finder thinking it'll be safe. It's not.
There may be a safe way to use it but I wouldn't recommend it.