Macro Magnifiation
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michaelgreen78
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The magnification ratio is along the lines of the following:
A ratio of less than 1:1 ie 1:2 or more is not considered a "true" macro, a ratio of 1:1 is a standard macro and 2:1 and bigger are increasingly magnified macros.
The ratio, as I understand it, is the magnification of the subject as captured on the camera's sensor. 1:1 projects a lifesize image onto the sensor. 1:2 is half lifesize and 2:1 is double lifesize on the sensor and so on.
Hope that helps!
A ratio of less than 1:1 ie 1:2 or more is not considered a "true" macro, a ratio of 1:1 is a standard macro and 2:1 and bigger are increasingly magnified macros.
The ratio, as I understand it, is the magnification of the subject as captured on the camera's sensor. 1:1 projects a lifesize image onto the sensor. 1:2 is half lifesize and 2:1 is double lifesize on the sensor and so on.
Hope that helps!
Slapo
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In short, if your camera has a sensor that's z mm wide, then with 1:1 macro, if your subject is also z mm wide, it'll be spread across the whole image.
With 2:1 macro, you'd capture half of that subject, while with 1:2 (0.5x magnification) you'd have it on half of the width of your image image.
EDIT: well, it's about what michaelgreen78 wrote
With 2:1 macro, you'd capture half of that subject, while with 1:2 (0.5x magnification) you'd have it on half of the width of your image image.
EDIT: well, it's about what michaelgreen78 wrote
pxl8
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With a standard macro lens at min focus you get 1:1 no matter what size sensor you're using. When you start adding extension tubes or close up lenses you can get up to 2:1 (2x). The next step from there is the MPE-65 which does up to 5x mag. The figures people quote are generally rough guesses based on experience of their set up but if you want to calculate the exact mag the simple method is to take a shot of a mm scale on the ruler and divde that by the width of your sensor, eg:
ruler shot shows 18mm
full frame sensor 36mm
36/18 = 2x mag.
There are lots of fancy formulas for calculating the mag based on focal length, extension, etc. but the ruler method is faster and generally more accurate as focal length changes with focal distance.
ruler shot shows 18mm
full frame sensor 36mm
36/18 = 2x mag.
There are lots of fancy formulas for calculating the mag based on focal length, extension, etc. but the ruler method is faster and generally more accurate as focal length changes with focal distance.
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Well, yes and no.
Most macro lenses achieve a 1:1 (lifesize) ratio at their minimum focus distance (MFD). Using a macro lens on items or bugs smaller than the sensor size is usually achieved by setting the lens at the MFD and then physically moving the lens towards the subject until focus is achieved. When the subject's focussed it's 1:1
Adding extension tubes behind the lens can increase the magnification by reducing the MFD. The length of the added tube or tubes can be used to calculate the new maximum magnification at MFD.
Canon's MP-E65 goes from 1x to 5x lifesize and this is simply marked on the body of the lens.
HTH
Bob