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Warning - "sun" filters
There is a Chinese company that still sells eyepiece screw-on "sun" filters. They give the warning below (in red).
I think the best warning is "Do not use these filters at all - high risk of cracking and causing serious permanent eye damage!!" I think these type of filters are banned for sale in Australia.
They are very cheap - if you are tempted to buy one - don't.
Note:
Solar filter can only see the sunrise and sunset
Viewing time from 30 seconds to 60 seconds for the gifted
Not long look
Otherwise there is a risk of explosion lenses
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