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Author Topic: Lens 1:1 ???  (Read 2161 times)

Goodlistener

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Lens 1:1 ???
« on: July 11, 2007, 10:21:38 pm »

Questtion please:  When people say that a lens will focus 1:1 as in a macr lens, what does this mean?


Just wondering.

Thanks for the help too.
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DarkPenguin

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Lens 1:1 ???
« Reply #1 on: July 11, 2007, 10:36:49 pm »

From Wikipedia...

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Macro photography refers to close-up photography; the classical definition that the image projected on the "film plane" (i.e film or a digital sensor) is close to the same size as the subject. On 35 mm film (for example), the lens is typically optimized to focus sharply on a small area approaching the size of the film frame. Most 35mm format macro lenses achieve at least 1:2, that is to say, the image on the film is 1/2 the size of the object being photographed. Many 35mm macro lenses are 1:1, meaning the image on the film is the same size as the object being photographed. Another important distinction is that lenses designed for macro are usually at their sharpest at macro focus distances and are not quite as sharp at other focus distances.
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Khun_K

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Lens 1:1 ???
« Reply #2 on: July 12, 2007, 01:31:25 am »

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From Wikipedia...
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Simple way to describe will be regardless the film size, if you shoot an object, for example a measuring tape or ruler, if you shoot at 1:1 the scale appeared on your film should be exact same scale as the ruler, 1cm=1cm, and if you shoot with a lens of 1:2, then the scale on the film will be 1/2 the scale of the object you shoot, 1cm=0.5cm. But of course, larger film will record more area but the scale is always constant.
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