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You should preset the focus offset to 850 800 microns (or any known happy focus value from experience) using the stdfocus button or asking the telescope operator. You will also use this for focbase.
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x | x coordinate in pxls of star on a full frame image at the selected binning; there is no default. | ||
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y | y coordinate in pxls of star on a full frame image at the selected binning; there is no default. | ||
title | this is used for a heading in the focus log; may be multiple tokens- default is empty string | ||
bin | integer for binning factor- LMI default is 2. Other values not tested. 1:1 has also been tested. Note x,y coordinates must be in the same scale. | ||
exptime | exposure time in seconds for acquisition and focus sweep images. May be adjusted. | ||
filter | name (like "R") of the filter setting to do the focus sweep. "Nominal" means use the filter as previously set. Leave this blank for LMI. | ||
focstep | delta for focus setting per sweep position. (defaulted to 40 microns on LMI) | ||
focbase | setting of focus for acquisition and sweep center. This has a reasonable default (850 800 microns on LMI). | ||
flags | strings, all optional, defined in any order, as follows: | ||
| save ( put images taken in focus sweeps in a subdirectory in the main image directory.) |
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| conditioning ( focus run is a dry-run; the final focus setting is always focbase.) |
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| noexptimeadjust | suppress noexptimeadjust ( suppress autoadjust of exposure times for both acquisition and focus measures.) |
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| lowlight ( use lower thresholds for light level in acquisition & focus ) | |||
| low ( same as lowlight) |
Exptime is a floating point value for exposure time in secondsExptime is a floating point value for exposure time in seconds, defaulted as 1.0. If specified as two tokens, the second value is the number of singles to be taken, defaulted as 1. If specified as three tokens, the second value is the number of basic occultations to be taken, and the third value is the number of frames (NAXIS3) for each occultation. Occultations not currently available for LMI.
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- The script may still occasionally terminate without a clear indication that it has completed, or whether it succeeded or not.The script probably does not work for camera binning factors other than 2:2.It would be useful to put some temperatures data in the focus log.
- It would be extremely helpful if the LOIS analysis measured image ellipticity and this were logged and displayed during focus runs.
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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 | 850800.0 | 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. | |||
| focminpeaklow | 1400 | minimum max pixel in ADU's allowed for a focus image source, if the lowlight flag set. | |||
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 | |||
acqminpeak |
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| acqminpeak | 1000010000 | minimum max pixel in ADU's allowed for a acquisition image source. |
| acqminpeaklow | 2800 | minimum max pixel in ADU's allowed for a acquisition image source, if the lowlight flag set. | |||
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. |