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Old May 17, 2006, 10:28 PM   #1
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I was wondering, where is 1:1 achieved wiht a macro lens? is it at its minimum focus distance? is this a stupid question? sorry if it is. Also im considereing the Sigma 150mm Macro, and coudl this lens just be used as a medium telephoto, just not macro work? thanks
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Old May 17, 2006, 11:52 PM   #2
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Technically, 1:1 is considered "life-size". That's always been defined to me as life-size on the film plane (or sensor plane) if you will. So if you're taking a picture of a coin like a U.S. penny which is 19mm in diameter, the image on the surface of the film or sensor would also be 19mm at 1:1 magnification.
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Old May 18, 2006, 8:18 AM   #3
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billybobbovine wrote:
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I was wondering, where is 1:1 achieved wiht a macro lens? is it at its minimum focus distance? is this a stupid question? sorry if it is. Also im considereing the Sigma 150mm Macro, and coudl this lens just be used as a medium telephoto, just not macro work? thanks
When people use film cameras, especially slide film they can not easily crop their slides as we do with digital files. So to show tiny insects or objects in the screen with your slide you had to be able to fill your frame when you took pictures. With DSLR 1:1 do not have much meaning.

Yes you can use your Sigma 150mm as macro lens.

This mosquito taken with D50 and MicroNikkor 60mm is actually much bigger than life size.
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