Flat Field Lens - Medium Format Photography Forum

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Q. Flat Field Lens

Asked by milind mehetre (K=0) on 8/11/2004

Can anybody tell me what is flat field lens?What is its special application?Can it be used with medium format camera as general purpose lens or for Portraits or Landscape photography?

al shaikh

(K=15790) - Comment Date 8/11/2004

Flat field lenses generally are used in macro photography or copy work (shooting paintings etc), they can be used for portraits or landscape photography if you want to but most people don't. They are corrected and balanced mostly for close up work at miniscule levels of depth of field.

Harvey Guikema (K=313) - Comment Date 8/12/2004

Most lenses are a curved field design. This means the distance that is focused is in an arc from the film plane. If you are focused 4 feet from your subject, it is in a 4 foot arc that your main focus point is from your film plane. Flat field lenses are an attempt to keep parallel planes in focus. As you begin to get closer to your subject, it becomes more critical. When you wish to photograph a stamp, and fill the frame with it, a flat field lens will keep it in focus (theoretically) from edge to edge and a larger f stop than a curved field lens (at f8 rather than f32).
Hope this doesn't add to your confusion.
Harvey

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