Meade 24.5mm super wide-angle eyepiece, multi-coated for a clear view. This was included with a Schmidt-Cassegrain telescope I purchased about 30 years ago, but I never used it, so it has been stored indoors. It has never been exposed to dew. It looks clean to the naked eye. However, it is old, so I'm selling it cheap, no claims and no returns. - Focal Length: 24.5mm - Features: Wide Angle - Coating: Multi-Coated Thank you for looking.