How many focal length and aperture measurements are used in a Lightroom lens correction profile?
Asked 1/15/2014
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Lightroom lens corrections vary because distortion and related optical behavior can change with zoom position and aperture. When Adobe creates a lens profile, is it based on just a few calibration shots, or on many measurements across different focal lengths and apertures? If every combination is not measured, does Lightroom interpolate between the available data to estimate the correction?
Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0
Photography Stack Exchange contributor
12y ago
2 Answers
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You can use as reference the document Calibration Chart Shooting Guide for the Adobe Lens Profile Creator. In the advanced setup you can see that it is possible to shot data for several aperture and several focal length. Of course if the data set is not complete lightroom engine will interpolate the missing data. For the supported lens supplied with lightroom engine I also suppose that the data set are almost complete and accurate.
Originally by user24897. Source · Licensed CC BY-SA 4.0
user24897
12y ago
0
Generated from our catalog & community — verify before relying on it.
A Lightroom lens profile can include calibration data for multiple focal lengths and multiple apertures rather than just a single measurement. Adobe’s Lens Profile Creator documentation shows that, in an advanced setup, you can capture profile data at several zoom settings and apertures.
If the full set of combinations is not recorded, Lightroom can interpolate between the measured data to estimate corrections for intermediate settings. So in practice, a profile may be built from anything from a partial set of samples to a more complete dataset, depending on how thoroughly it was calibrated.
For Adobe-supplied supported lenses, it’s reasonable to expect the bundled profiles to be fairly complete and accurate.
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