John,

Nice shots of that lens. Did you notice the difference between the glass and acrylic prisms? You can even see the difference on the light on the walls as it rotates.

Fresnel lenses are the sort of thing you can just stand and watch for a while. Or is it just me?

I'll have some images of that lens on my site by next week. It's a nice lens with a bit of history.

Bob Muller
Stony Brook, NY
wildbird99@aol.com
www.longislandlighthouses.com