I am finding this very difficult to ascertain – using Christian Buil’s advice, the setting is 2.62mm on the ZWO helical focuser BUT I seem to have sharper image of spectral lines in practice at 2.50mm…….
I am finding this very difficult to ascertain – using Christian Buil’s advice, the setting is 2.62mm on the ZWO helical focuser BUT I seem to have sharper image of spectral lines in practice at 2.50mm…….
