@Astrobum
Those are very nice, allowing considerable enlargement and still offering up details. A clever adaptation of a long focus refractor.

I use a 5 inch #Caasegrain #Nexstar5SE , which is also short, being about a foot long. It is an f10. It looks to me like your pixel resolution is better that the equipment I use, but here's an image taken with it just for comparison.

#Albategnius lunar region.