Just purchased a new Askar FRA600 scope and trying to set everything up. I am using it with ZWO ASI2600MC cam and ZWO EAF focuser.
I run the first vcurve wizard and could not finish it due to errors. To make it work I ended up with the following HFD parameters: 8, 20, 35; MIN Flux: 200; MAX Flux: 1000. I built 5 vcurves for the best precision.
Now I am able to focus without any problem with dual band filter as well as without it. My focus position without a filter is 3877 and with filter it is 4123.
However, when I am imaging without a filter at 3877 position and switch to a filter, then I have to move the focuser out to 4100 so it could focus on a star (AcquireStar). And vice versa, if I am imaging with filter and want to image without it, then I have to move the focuser in to 3900. Without those preliminary moves IN or OUT I am getting HFD errors and the focuser cannot focus.
Is it a normal behavior? Previously with my Newtonian scope I didn’t have such an issue and I could focus straight with or without a filter. Am I doing something wrong?