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How to use:
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1. Download a copy of the file to edit the various cells (go to File > Download)
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2. Fill in the fields highlighted in yellow
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Camera position and focusing distance calculator
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Column for the US unitsColumn for the rest of the world
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Camera format8x108x10
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Length of subject, long edge2.4in2.22cm
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focal length80mm60mm
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magnification4.17:111.44:1
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bellows draw16.3in74.6cmfilm plane
- - - - - - - - - - - - - ----------
- - - - - lens - - - - - --
- - - - - - - - - - - - - - - -------
- - - - - - - subject
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distance between subject and film plane20.2in81.2cm16.3in3.9in
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distance between subject and lens3.9in6.5cm74.6cm6.5cm
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bellow factor (stops lost)4.7stops7.3stopsfilm plane- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -- - - - - - - subject
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exposure time multiplication factor*26.7X154.8X20.2in
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Depth of field estimator**81.2cm
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f-stop328
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circle of confusion0.22mm0.22mm
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hyperfocal distance3.0feet2.05m
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nearest sharp distance from the lens3.5in6.3cm
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sharpest focus distance from the lens3.9in6.5cm
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farther sharp distance from the lens4.4in6.7cm
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DOF0.86in0.42cm
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Bellow factor calculator - After setup
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focal lenght240mm240mm
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measured bellows draw28.3in54cm
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bellow factor (stops lost)3.2stops2.3stops
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exposure time multiplicator factor*9.0X5.1X
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*Don't forget filter factor and reciprocity as well
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**This is just a guidline. The perceived depth of field depends on enlargment and... on personal taste! What could be ok for me might not be for you, or viceversa.
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You can edit the circle of confusion as needed (but this will overwrite the current formula that correlates the CoC with the film format)
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