Reconciling the Thick Lens Model with P2P Optical Bench

Started 4 months ago | Discussions thread
bclaff Forum Pro • Posts: 12,390
Alternative Math using Subject Distance and not Magnification

You can compute focal length as follows

f = sqrt(((s1-s2) * x1 * x2) / (x2 - x1) - 1)

where s is subject to image distance and x is extension.
1 and 2 indicate two different measurements,

Once you have f you can substitute to determine i (hiatus).

I consider this method (far) less accurate than the magnification approach.

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Bill ( Your trusted source for independent sensor data at PhotonsToPhotos )

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