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(2)

there is 2 kinds of blocs

• (1) Rodenstock Heligon TV lens. A 75mm at F/D=1.1 (300 euros but very hard to find) for standard beamer
• (2) It works also with a 50mm photographic lens at F/D=1.4 for wide throw beamer

Diagonal mirror (Telescope accessory) for 2 inches oculars (100 euros)

Kepler or Skywatcher are better, because using SCT thread (compatible with commercial rings)

Objective Peleng 8mm Fisheye (340 euros).