On 2014-10-25 03:14:56 +0000, John McWilliams said:

On 10/24/14 PDT, 9:24 AM, PeterN wrote:
On 10/24/2014 10:58 AM, Tony Cooper wrote:
On Fri, 24 Oct 2014 10:47:24 -0400, PeterN wrote:

On 10/24/2014 1:13 AM, Tony Cooper wrote:
This looks like an abstract, but it's a shot straight from the camera
taken this weekend. All that was done to it was a slight pulling-in
of the points in Levels and a crop in Photoshop. No sliders were
slid.

http://tonycooper.smugmug.com/Curren...0-22-42-X2.jpg


I'll let you figure out what it is.


I could not readily tell so I cheated and checked the Duck's and Eric's
answers.

I still don't know for sure.

They are correct. It was taken the other day at the Ponce Inlet
Lighthouse. There is a building there that contains a number of
different styles of lenses and mechanical devices used in lighthouses
in the past.


That is a really neat image.

Yes, it is.

Fresnel lenses have been around for over 200 years, in use in US since
the mid 1800's. They first used whale oil, later kerosene, then
electric, though I am unaware of any Fresnel lenses in use on the West
Coast now.

There have been quite a number of fresnel lenses employed on the West
Coast. However, all the fresnel lens installations on functioning
lighthouses here have been replaced with automated aircraft beacons.
Around here at Cambria the old Piedras Blancas lighthouse fresnel lens
can be seen in one of the village parks.
Also the retired Point San Luis Lighthouse fresnel system was on
display at the San Luis Obispo County Historic Museum & Library until
it was returned to the restored light station in 2010, where it is on
display and can be viewed by visitors.
http://www.lighthousefriends.com/light.asp?ID=91

--
Regards,

Savageduck