Quote:
Originally Posted by kosborn
Hi Craig,
I can't really explain your AF problems but it would seem to me that it's better to trust the Bahtinov mask (despite what the numbers might suggest). I don't know the ASIair device but there are a couple of things to consider for autofocus routines. When using NB filters it's important to have a long enough exposure. The other things to consider are number of autofocus steps and step size. Although this video talks about SGPro autofocus, the theory is the same for all apps and might help.
Kevin |
Hi Kevin,
Even ignoring software analysis of FWHM, doing a flip-between at 100% of the image focused with the mask vs without the mask, there was still a noticeable difference in star size. Not like one was clearly out of focus, but enough of a difference you could tell them apart. My eye agreed with what the software reported on star size.
Thanks for the video link, I will check it out.