After the telescope was now ready we went to the first test. 

Fixed on an EQ5 mount the small telescope looks a bit lost but doesn't matter. Right at the beginning I had to find out that the focusing over the thread of the PVC pipe works only limited. In spite of grease the thread tends to jam which leads to constant wobbling during adjustment. With a little patience it works nevertheless.

The first test was done with a 26mm Super Plössl from Bresser. Together with the focal length of 335mm this gives a magnification of almost 13x. The picture is clear and sharp, there are only a few color errors visible. Naturally the image is upside down, otherwise the telescope would be very useful as a spotting scope. If necessary I build a shorter tube piece again to allow the use of an Amici prism. 

In the night sky the use is limited. For planetary observation the magnification is too low and for galaxies or nebulae the light intensity is too low. 

But as a viewfinder telescope it would be a great thing. There is no crosshair here, but there are suitable eyepieces for it. Definitely something I will continue to work on. 

The 2nd test was done with a Skywatcher 6mm planetary eyepiece. This results in a magnification of almost 56x, which is the normal magnification for the lens. Here is the big surprise: Saturn and Jupiter could be seen surprisingly well. The ring of Saturn was clearly visible. At Jupiter you could see the two big storm bands. That was more than I expected, but my only reference is a 80/640mm refractor from Bresser. Its imaging performance is actually only slightly better.

What is still noticeable with Jupiter is a clear ring of light. I suppose this could be due to insufficient inner blackening. I think I will see if this can be improved and then compare.