by Jon

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Firstly, focus stacking is generally used for macro photography. So, you'll want to keep the camera in the same position to have consistent framing. As mattdm has commented, you get different background compressions. The same thing when you use the same focal length, but different sensor sizes and subject distance. Invariants in subject size and depth of ...


You are simply making the wrong assumptions. Just "playing around" and thinking you see a correlation doesn't mean that it actually exists. You've just fixed the sensor format at APS-C, aperture at f/22 and tried varying the focal length and subject distance a bit and thought that you saw a correlation. However if you try these settings for example: f/2.8, ...

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