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They Mysteries of FocusMax (FMx) and RoboFocus (RF) with an ST-7E



 
 
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Old May 6th 06, 06:12 AM posted to sci.astro.ccd-imaging
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Default They Mysteries of FocusMax (FMx) and RoboFocus (RF) with an ST-7E

Here are few questions about the use of FMx and RF (Robofocus).
FMX:
1. What is Simulator mode? It doesn't really seem to simulate anything, but
starts a search for the focus point--I think.
2. Why the dip in the middle of the HFD curve? SCT obstruction?
3. What are the red and blue circles?
4. It seems like my profiles disappear when either I return the next night,
or perhaps if I do more than one "First Light". Is FL a one time only operation?
5. I belive the ST-7E's lowest shutter speed is 0.2 but I see FMx tries to
shoot at 0.110 sometimes. Sounds like a problem?

RF:
1. If I do a modest focus movement, 20-40 microsteps, I can see that the
image has shifted in the CCD image. What's up? Mirror shift? That would seem
a bit too sensitive, since I'm generally shooting high in elevation.
2. Does one need to calibrate (Full Manual Calibrate) each night?

Wayne T. Watson (Watson Adventures, Prop., Nevada City, CA)
(121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
Obz Site: 39° 15' 7" N, 121° 2' 32" W, 2700 feet
--
"In ... Philosophical Theories as well as persons, success
discloses faults and infirmities which failure might have
concealed from observation." -- John Stuart Mill, On Liberty

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