Doubts about the best focal.

[Stefanosky]

The only flaw (so if we can call it) that I can find us, as a simple reader of Bartolomei Mirco's article on the sizing of any baffles and hoods, concerns the necessity in case of shortened truss structure, to put on a longer hood, just as in the case of a shortened monolithic tube it would be necessary to add protection since the eyepiece would no longer be parallel to the horizon but directed at a much greater angle.

[Giulio TiberinI]

This is also absolutely true. But in practice this is already the case in my telescope.
In fact I , contrary to the common thought that foresees a secondary case of the lightened telescopes, limited to a simple and thin terminal circle, I prefer a classic type case with a depth that hides the”vista”of the eyepiece in the disturbing light coming from 360 degrees, unfortunately almost always present.

That blue telescope of mine was published in the American magazine Sky and Telescope in September 2916, for my strange experimentation with a parking disc brake as an elimination of the balancing problem, and had received the interest of another editor for the solution of the inclined eyepiece. That solution is also described here with an article.

[Giulio TiberinI]

as regards any plaster tool with anegated stoneware tiles (or embedded steel hex nuts) in plaster, see this rich tutorial document:
https://www.google.it/url?sa=t&source=web&rct=j&url=http://www.astrosurf.com/astroptics/files/outil_ceramique111.pdf&ved=0ahUKEwjY6OeK6o_VAhVKAZoKHSw4BsYQFgghMAE&usg=AFQjCNHbYplcDsf-ZWFkG_4FHtOJLgCkYA

[Author]

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