Information from our eBoard provided by Mike:

Solar filters for astronomical telescopes.

https://www.bing.com/search?q=solar+filters+for+telescopes&form=ANNTH1&refig=8d6f88218b7144768166e8faa7078d30&sp=1&lq=0&qs=HS&pq=solar+filters&sc=10-13&cvid=8d6f88218b7144768166e8faa7078d30

  Solar filters for binoculars.

https://www.bing.com/search?q=solar+filters+for+binoculars&qs=MT&pq=solar+filters&sk=HS1LS1AS1&sc=10-13&cvid=B5895A0AACA44E62BCC0B68B42BA5D9B&FORM=QBLH&sp=4&ghc=1&lq=0

 Solar filters for camera lenses.

https://www.bing.com/search?q=solar+filters+for+camera+lenses&qs=AS&pq=solar+filters+f&sk=HS2LS1&sc=10-15&cvid=E24598EA02A14B36B038138BA6092E61&FORM=QBLH&sp=4&ghc=1&lq=0