NavList:

Dear Martin,

Congratulations with your purchase.

As far as I know, that telescope is only used for collimation.

This is not so. Try it and you will see that it is an excellent telescope for almost all observations, especially for Lunar distances. Superior to the 3x Galileo tube. The general recommendation from manufacturer recommends using the inversing telescope for day observations and Galileo scope for twilight. In Russian manuals the inverting one is called a Sun scope, and the Galileo telescope the night tube.

But they do not discuss Lunars. The reason why the Galileo scope is recommended for twilight observations is that it lets more light in, which may be important for better visibility of the horizon in twilight.

Years ago I measured with this sextant hundreds of  distances, including star-to-star, and Lunars with Sun and various stars. I don't think taking into account Jupiter (and even Venus) diameter  makes any difference in accuracy.

I usually took 3-5 observations at a time, and then used the average.

Alex.