What is a "flat photographic lens" called ?
Letters are  F R E (BLANK) N (BLANK) L

Hi Sugarboy!


I am confident that you are referring to the fresnel lens. Below you
will find references where you may verify that this is the correct
answer.


The Fresnel Lens

?For many photographers, however, the fresnel lens is the solution to
the uneven ground glass. The Fresnel is a true lens, flat, about one
sixteenth inch thick, divided into extremely small segments in the
form of concentric rings. Its function is to redirect the ray bundles
of the ground glass, especially the edges of the glass, to the central
viewing position.?

Source: The Wisner Company
http://www.wisner.com/viewing.htm


You may read more about the Fresnel Lens at How Stuff Works
http://www.howstuffworks.com/question244.htm


Fresnel lens at Bizrate.com
http://shop.bizrate.com/buy/products__cat_id--11100800,keyword--fresnel%20lens.html


Here is a question at a message board at photo.net:

Should a fresnel lens always be flat?
http://www.photo.net/bboard/q-and-a-fetch-msg?msg_id=006FpJ



Search Criteria: 

Fre*n*l lens
http://www.altavista.com/web/results?q=Fre*n*l+lens&kgs=0&kls=1&avkw=aapt

fresnel photographic lens flat
://www.google.com/search?sourceid=navclient&ie=UTF-8&oe=UTF-8&q=fresnel+photographic+lens+flat



I hope you find this helpful! If anything is unclear with my answer,
please ask for clarification.

Best regards,
Bobbie7

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Clarification of Answer by bobbie7-ga on 06 Dec 2003 21:05 PST

Definitions of FRESNEL LENS on the Web:
://www.google.com/search?sourceid=navclient&ie=UTF-8&oe=UTF-8&q=define%3A+fresnel+lens

Here is more information about the fresnel lens.
http://www.3dlens.com/