German mounting
Inauguration: 29 September 1935
Aperture: 40 cm, Focal lenght: 600 cm
Image scale: 34"/mm

Reflector: Parabolic mirror:
Aperture 60 cm, Focal l. 240 cm

German mounting
Inauguration: 29 September 1935
Refractor: Four lens objective,
Aperture 40 cm
chromatic correction 390 to 460 m
Focal l. 200 cm
Image scale 1.42'/mm
Field 8^o
Photographic plate 30x30 cm²

Newton System:
plane secondary mirror,
22 cm at 45
Image scale 1'.22/mm
Field 2.6^o

Cassegrain System:
convex secondary mirror
15 cm
Equivalent focal l. 820 cm
Image scale 25"/mm
Field 50'

English mounting.
Moved from The Vatican to Castel Gandolfo,
was newly inaugurated in 1942.
Double refractor.
Astrograph: Aperture 33 cm.
Focal l. 343 cm
Photograpic plate 13x13 cm²
Image scale 1'/mm
Field 2 ^o
Collimator: Aperture 20 cm
Focal l. 360 cm

Fork mounting by Thomson & John Bowton Ltd
Optics by Hargreavers & Cox
Inauguration 16 november 1957
Spherical mirror: Apert. 98 cm
Focal l. 240 cm
Correcting lens, 65 cm
Image scale 1'.26/mm
Field 5^o
Photographic plate 20x20 cm²

1.8-m f/1.0 honeycombed construction
borosilicate primary mirror
0.38-m f/0.9 Zerodur concave secondary mirror