The StellarMate Plus Manual
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image.
· Subframe: Subframe around the focus star during the autofocus procedure.
Enabling subframing can significantly speed up the focus process.
· Full field: Measure average HFR from all stars combined in a full frame. This
method defaults to the Centroid detection, but can use SEP detection too. Its
performance decreases as the number of stars increases.
· Suspend Guiding: Suspend Guiding while autofocus in progress. If the focus
process can disrupt the guide star (e.g. when using Integrated Guide Port IGP
whereas the guider is physically attached to the primary CCD), then it is
recommended to enable this option. When using Off-Axis guider, then this
option is not necessary.
· Dark Frame: Check this option to capture a dark frame if necessary and
perform dark-frame subtraction. This option can be useful in noisy images.
· Box: Sets the box size used to enclose the focus star. Increase if you have
very large stars.
· Annulus: During full field focusing, stars which are inside this percentage of
the frame are filtered out of HFR calculation (default 0%). Detection
algorithms may also have an inherent filter.
· Settle: Sets the amount of seconds to wait before resuming guiding.
Process
The Process page has the following options:
· Detection: Select star detection algorithm. Each algorithm have its strengths
and weaknesses. It is recommended to keep the default value unless it fails to
properly detect stars.
o SEP: Source Extractor and Photometry, an efficient source detection
method based on Source Extractor (Bertin and Arnouts 1996; Bertin
2016). See SEP: Source Extractor as a library in the Journal of Open
Source Software.
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