In my previous post, I expressed intent to show pictures of the various sizes of Fresnel lens to help you better understand the different sizes. Since I only have personal pictures of the first-order Fresnel lens, my plan was to use the Internet to obtain pictures of the other sizes and post them here in my blog. However, due to copyright and the time and effort to obtain written permission from the owners, I have decided to provide the lens size information without the pictures. To help you visualize and comprehend the sizes, I have posted another picture of the first-order Fresnel lens from the Umpqua River Lighthouse. Remember what I wrote in the last post: The larger the number in the name of the lens, the smaller the lens. For example: The "first-order" lens is larger than the "third-order" lens.
Lens Order / Name Lens Height Lens Inside Diameter
Second Order 6'1" 4' 7"
Third Order 4' 8" 3' 3"
Third and 1/2 3' 0" 2' 5 1/2 "
Fourth Order 2' 4" 1' 8"
Fifth Order 1' 8" 1' 3"
Sixth Order 1' 5" 1' 0"
I hope this information will still be helpful to you without the pictures. You can view pictures of the different size Fresnel lens on the Internet. In your browser enter: Fresnel Lens
No comments:
Post a Comment