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Extension tubes caracterization
We're gonna calculate these parameters :
- Lens focus distance
- Framer size
- Depth of field (Pc)
- Reproduction ratio
To do this, we need to know the following parameters :
Lens focal length : mm
Extension tubes size : mm
Lens shooting distance : m ( inf for infinity )
Aperture :  
Film height : mm
Film width : mm
Circle of confusion diameter : mm
Index of refraction :  


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