I have a ZWO EAF focuser with the temperature probe fitted.
I've noticed that changes of a little over 1 degree can significantly change the focus of my RASA enough to be noticed.
I understand that focus adjustments due to contraction or expansion of the OTA are extremely linear so easy to compensate for by temperature.
The ZWO driver has a temperature compensation feature and the probe appears to be very sensitive.
Is there any software that will allow capture of the focus points vs temperature automatically or will I need to focus at any given temperature change & plot the results to work out if I truly see a linear data set?
I looked at T-comp- it appears to be a very expensive piece of "shareware" quality software at $50.00 which is quite expensive for a utility.
Does anybody know if there is anything free that will do the job or am I just better in trying to plot my own graph and feed the change per degree into the ZWO focuser at perhaps interval measurements of 2-3 degrees?
Please let me know your thoughts.