27904Re: "Sharpness" in CCDSoft
- Jun 1, 2004
> Did you have Autodark turned on? Hot pixels can make a mess offocusing
> algorithms.Yes, autodark was on.
> Also: whataverage 3 or
> was the seeing like? If seeing jumping around, then you need to
> more readings at each focus position in order to clean up the dataand
> remove seeing-induced noise.The seeing was moderate and there was ample light pollution and moon
glow. Nonetheless, the seeing figure did not in any way reflect
what were obvious visual changes to the focus. If I read the manual
right, it is a relative measure based on a starting point that is
out of focus. Perhaps I reset the graph too close to critical focus?
Prior to trying sharpness, I had been using maximum pixel with good
results, but wanted to try the measure that was supposedly better.
Designed more for automated than manual focusing?
After trying out the new MaximDL tonight and using FWHM, it worked
very well. I did have a situation where the focus suddenly changed
by 1.5mm, as measured by the DRO. I need to do a little checking to
see why that may have happened -- that's for another post.
- << Previous post in topic Next post in topic >>