Diffraction Limit Discussion Continuation

Started Feb 21, 2014 | Discussions thread
TomFid Senior Member • Posts: 2,521
So is this one

Sorry, couldn't resist.

Admittedly the cubic fits are problematic. But it's almost as silly to fit a quadratic and discuss significance, treating this as a noisy sampling process. These are engineering measurements with fairly high precision, so presumably the issues with the quadratic fit are due to systematic problems with the model, which we'd expect from first principles, not from underdetermination.

Probably best to stick to just eyeball the raw data, and be satisfied with its 1 stop interval. Or, build a model with a sensible functional form and fit it to a larger sample of body/lens combinations.

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