FastFocus - web demo

Stack

Slices-
Current Z-
Sharpness-

Scrub Z 0

Metric

Focus measure

Ctrl+drag on the image to measure focus inside an ROI only.

Result

Peak slice-
Parabolic Z*-
Evaluations-

A parabola through the peak and its two neighbours gives a sub-step focus estimate - the trick that lets the real tool use ~5-12 images instead of 30-100.