The Fresnel Lens
Photos of Lenses
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This massive fixed first-order lens is from the Assateague Island Lighthouse.  This lens can be seen at the Oyster & Maritime Museum on Chincoteague Island, VA.  This style of lens is often referred to as a "beehive lens."
Even lightships were equiped with Fresnel Lenses.  This particular one is on display in the Portsmouth Lightship.
This fixed fourth-order lens is from the Smith Point Light and is on display in the Naval Shipyard Museum in Portsmouth, VA.  It was manufactured in Paris in 1894.
A fixed fourth-order lens is still in its home at the Hooper Strait Lighthouse.
This third-order bull's-eye lens is on display in the Hooper Strait Lighthouse
The lens from the Cape Canaveral lighthouse is on display at the Ponce Inlet lighthouse.  This is an example of a first-order bull's eye lens.
A sixth-order lens can be seen at the Oyster & Maritime Museum on Chincoteague Island, VA.  This lens was once used at the Fort Washington lighthouse.
A fixed fifth-order lens on display at the Hooper Strait Lighthouse.
The Cape San Blas lighthouse currently uses a third-order "bi-valve" or "clamshell" lens.