Feature #559: Retry with higher defocus when cross-correlation not possible - Leginon - Electron Microscopy Group

Actions

Copy link

Feature #559

closed

Retry with higher defocus when cross-correlation not possible

Added by Matthias Brunner over 14 years ago. Updated about 9 years ago.

Status:

Closed

Priority:

Normal

Assignee:

Category:

Target version:

Appion - Appion/Leginon Future Version

Start date:

05/25/2010

Due date:

% Done:

Estimated time:

Deliverable:

Description

DriftMonitor reports absurdly high drifts (1-10um/s) when the image is coincidentally being recorded exactly at focus and hence with low contrast. This means that it will cause an adjust target, go into drift monitor again, again reporting absurdly high drifts, and go into an endless loop target adjust / drift monitor. Drift value should be checked for sanity and measurement retried by incrementing the defocus value.

Same with autofocus
If focus is off by +2um, and fa is set to -2um contrast is sometimes very low and correlation is not possible. If this is detected fa should be temporarily set to -3um, -4um, ... and focussing retried.