Calculate magnification at different working distances

Started 11 months ago | Questions thread
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Prick Forum Member • Posts: 71
Calculate magnification at different working distances

As far as I know the magnification does not change linear to the working distance (correct me if I'm wrong). Is it however possible to calculate it?

For example:
The magnification is 1:1 at a working distance of 30cm for a given 100mm lens.
What is the magnification at 60cm or 90cm?

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