Ricoh PENTAX K-3 Mark III Faq page 51

Q: What kind of function is "Lens Correction" and what different types are
available?
A: The following features can be set in [Lens Correction] of the Capture 6 menu.
Distortion correction
Peripheral Illumin. Corr.
Lat-Chromatic-Ab Adj
Diffraction Correction
Setting.
Memo:
-Corrections can only be made when a compatible lens is attached. The features are
disabled when using accessories such as a rear converter that is attached
between the camera and the lens.
- When [File Format] is set to [RAW] or {RAW+}, correction information is saved as a RAW file par
ameter and you can select whether to apply the correction to the
images when developing them.
For the RAW Development function, [Color Fringe Correction] can
also be set.
- If set [Lens Correction] other than the default setting is selected, the image
storage will take longer.
Default setting:
Lat-Chromatic-Ab Adj – ON
Diffraction Correction – ON
Distortion correction – OFF
Peripheral Illumin. Corr. – OFF
Reduces distortions occurring due to lens properties.
Reduces peripheral light fall- off occurring due to lens
properties.
Reduces lateral chromatic aberrations occurring due to lens
properties.
Corrects blur caused by diffraction when using a small
aperture.
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