[Jackstar]

Hi,


I have a general question regarding using an electronic focuser.

I have one that does an annoying thing.

With this model, to calibrate, you set a "0" point where the focus tube is racked in.
You then send it to the outermost point and set that,

Lets say this point is "150000"


Now, what happens is:
i send it back to "0", it goes 2mm short of "0"

i then tell it to go to "120000" it goes 2mm beyond .
i then tell it to go back to "0" it goes 4mm short
etc etc.


To get around this when it goes back to "0" i then adjust the focus knob to take up the 2mm, then i have to re calibrate the "0" with a click on the software.


This is the annoying bit.
Is this normal with any of the electronic focusers?

I have tried leaving it out at the point of focus but then when i connect on NINA it seems to think it is set at "0" when it isn't.


Thanks


Jack