Feature #559
closedRetry with higher defocus when cross-correlation not possible
0%
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.
Updated by Neil Voss almost 14 years ago
- Target version set to Appion/Leginon Future Version
Updated by Matthias Brunner over 13 years ago
This is especially true for cryo images at 300kV...would be great if you could look into this.
Updated by Anchi Cheng over 8 years ago
This effect is achieved by duplicating the same focus sequence step.