Fresnel Lens

This is more a snapshot than anything else, but for those who own a Better Beamer, or have wondered what a Fresnel lens in big looks like, here is an image of the lens of the Pigeon Point Lighthouse near Pescadero, CA. It is a first order Fresnel lens. The "order" describes the size and focal length, and first order used to be the largest with a focal length of 920mm and a height of 2.59m, before someone decided that that was not big enough and built an even bigger one.

https://farm4.staticflickr.com/3753/...412b021a_b.jpg_AH08762 by ahab1372, on Flickr

Think of the bird shots Joel could get with that!!! ;)

Here's one local to me, a close up of the Fresnel lens at Boston Light. Second order, and still in operation.

Attachment 2192

Great shot John. They had one of those old 1000W light bulbs on display at pigeon point.


Arnt

Btw if someone has a few million USD to spare, they take donations to repair the lighthouse and put the lens back in its original place.


Arnt

Quote:

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Originally Posted by Kayaker72

Think of the bird shots Joel could get with that!!! ;)

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Oh yeah! Give me that with a 25,000mm f/4 lens and a really big tripod and I could get great images from a mile or so:)