diff --git a/docs/source/user_guide/operation.md b/docs/source/user_guide/operation.md index 44471da2..ebee8ac4 100644 --- a/docs/source/user_guide/operation.md +++ b/docs/source/user_guide/operation.md @@ -66,6 +66,14 @@ Run the [autofocus action](scheduling.md#autofocus-action). Ensure the `filter` Upon successful completion, the optimized focus position is updated in the configuration. Autofocus images and V-curve plot are saved to the `images/autofocus` directory. +```{admonition} Focusing Tip +:class: tip + +**Coarse Search (e.g., `fft`):** Best for broad ranges where stars appear as blurry "donuts." These non-parametric operators measure overall frame sharpness without needing to identify individual stars, making them nearly impossible to "confuse" with distorted optics. + +**Fine Tuning (e.g., `HFR`):** Best for precision near the focus peak. These algorithms fit a "V-curve" to the diameters of detected stars. They provide great accuracy once stars are point-like, but will fail during wide searches if the stars are too bloated to be recognized by the star-finder. +``` +