SBIG STF-8300 Manual
20
some dim objects though, checking this item, which uses dark
subtracted images for Focus mode can help to pull the object out
of the noise. It’s slightly slower when using dark frames so only
use this when you need to.
Filter Warm Pixels – Check this box to automatically filter out warm
(bright) pixels that can affect the visual appearance of the focus
frame and can contribute to artificially high readings during very
short focusing exposures. This is faster than using dark frames.
Update Mode – Sometimes you want to tweak the focus, look at an image,
tweak it again, etc. Setting this to Manual causes the Focus mode
to pause between images until the Space Bar is hit or you click the
Pause/Resume button.
Peak – This shows the position and brightness of the brightest pixel in the
Focus mode image. We’ll use this later to get the best focus by
maximizing the Peak on a star.
Pause/Resume – Click this button at any time to pause or resume the focus
mode. This can be handy for going back and forth between the
telescope and the computer or for studying the images.
You can read more about the other items in the Help but we now know
enough for basic operation. Exit Focus Mode by closing the Focus Mode
dialog or closing the image window.
You’ve come a long way in this brief tutorial. If you want to spend
some time reading the Help file or the CCDOPs Manual, which is included
on the CD-ROM that would be useful. Otherwise it’s time for trying it out
at the telescope.
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