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- On LMI, the instrumental magnitude increases a bit at the wings of the focus sweep- almost certainly means the object apertures for photometry are too small.
- The acqtry parameter is not honored.
LMI Definitions Applicable To The Focus Script
These are all in the LMI TCL definitions file. It is not recommended for observers to modify these.
biaslevel | 1000.0 | average bias level for A amplifier |
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occul_avail | 'no' | 'yes' or 'no', whether or not occultation exposures can be specified for focus |
foc_coloravail | 'none' | available filters for focus- 'none' means current (nominal) only |
foclog | 'testlmifocus.log' | log file name is obs acct home directory |
focfilter | 'nominal' | filter default when not specified to inplacefocus or stdfocus |
focstep | 40 | default size of focus steps in applicable units (microns for LMI) when not specified to inplacefocus or stdfocus |
focstep_max | 200 | maximum focus step size that can be specified to inplacefocus or stdfocus |
focstep_min | 5 | minimum focus step size that can be specified to inplacefocus or stdfocus |
focbase | 850.0 | default focbase in applicable units (microns for LMI) when not specified to inplacefocus or stdfocus |
focbase_max | 1500.0 | maximum focbase that can be specified to inplacefocus or stdfocus |
focbase_min | 10.0 | minimum focbase that can be specified to inplacefocus or stdfocus |
focexptime | 3.0 | default exptime in seconds when not specified to inplacefocus or stdfocus |
focexptime_min | .1 | minimum exptime that can be specified to inplacefocus or stdfocus |
focexptime_max | 10.0 | maximum exptime that can be specified to inplacefocus or stdfocus |
focfaint | 14.0 | minimum instrumental magnitude allowed for a focus image source. |
focminfwhm | 3.0 | minimum full width half maximum allowed for a focus image source. |
focminpeak | 2000 | minimum max pixel in ADU's allowed for a focus image source. |
focsaturatedpeak | 50000 | maximum max pixel in ADU's allowed for a focus image source- set to 0 for no saturation test. |
focadjustlims | { .6 1.6 } | minimum and maximum ratio of adjusted exptime to original for focus step retries |
focadjustetimelims | { .05 15.0 } | minimum and maximum ratio of adjusted exptimes in seconds for focus step retries |
foctry | 2 | total tries allowed for a focus step. |
focbin | 2 | default camera binning when not specified to inplacefocus or stdfocus |
focphotannuli | { 20 28 35 } | size in unbinned pixels of object, inner sky and outer sky annuli for focus sweep photometry |
focdelay | 10000 | delay in msecs after a focus move during focus sweep- large for LMI because move is open loop |
focretrydelay | 3000 | delay in msecs before a focus retry image is taken |
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acqminpeak | 10000 | minimum max pixel in ADU's allowed for a acquisition image source. |
acqsaturatedpeak | 30000 | maximum max pixel in ADU's allowed for a acquisition image source. |
acqadjustlims | { .2 4.0 } | minimum and maximum ratio of adjusted exptime to original for acquisition retries |
focadjustetimelims | { .05 15.0 } | minimum and maximum ratio of adjusted exptimes in seconds for acquisition retries |
acqtry | 1 | total tries allowed for an acquisition- really 2. |