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 7th & 8th Order Fresnel Lenses
#28542
03/25/05 09:55 PM
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Joined: Dec 2004
Posts: 247
Zachary
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On this page (Click) it says that there are 7th & 8th order fresnel lenses. Does anyone have a picture of one (or both) of these orders and information on the size of an 8th order?
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Re: 7th & 8th Order Fresnel Lenses
#28543
03/25/05 10:18 PM
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Joined: Mar 2002
Posts: 3,102
Bob Ott
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I didn't even know about all the lenses on your link. Thank you so much for the post.
bobo
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Re: 7th & 8th Order Fresnel Lenses
#28544
03/26/05 03:12 PM
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Joined: Dec 2002
Posts: 3,298
seagirt
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Thanks for that cool page, Zach. Never heard of them, though I may look into it. Might one of them be those little lenses used in very minor lights?
It says that the 8th Orders were mostly in Scotland. The 7th were the steamer lanterns. I think that 3" sounds awfully tiny for a 8th Order lens, even if it is Fresnel powered. Heck, the headlights in the Rover must be more powerful than that.
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Re: 7th & 8th Order Fresnel Lenses
#28545
03/31/05 11:04 PM
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Joined: Dec 2004
Posts: 247
Zachary
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This thread got alot of controversy at Lighthousing.net, if you want information (and even pictures) go here
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