Deregni, Angelo, 1750 c.?
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Basic Info

Maker: Deregni, Angelo

Year: 1750 c.?

Year Range: -

Year Notes:

Manufacturing Location: Venice, Italy

Signature: Angelo Deregni

Signature Notes:


No stand present.

Collection: Adler Planetarium and Astronomy Museum

Accession #: M-449


Project investigation

Public Notes:

Main tube covered in light tan vellum, blind stamped in a floral border pattern around two sections of circumference. Stamped design is darker brown. Maker's name stamped near decoration. Turned ebony and horn mounts at both ends. Three white vellum draw tubes, first has horn ferrule. Extension position lines drawn on tubes in ink. Screwed onto each end are brass caps with dust slides. Erector tube has 3 lenses with soft wood mounts.

Length (open): 820 mm

Length (closed): 332 mm by 47 diameter


Exit pupil:

Object status:

Optical Basics

Objective type: singlet

Optical style

Physical style spyglass

Functional style

Materials: horn, vellum, wood, glass, brass

Optical/Lab Data

Drawtube data:

Drawtube notes:

Objective Data

CA curvature (diopters): CB curvature (diopters): PD lens power (diopters): fD focal length (mm): t thickness (mm): free aperture (mm): full aperture (mm): nD refractive index: ν Abbe No.:
Lens 1 1.85 ± 0.013 1.97 ± 0.009 506.90 ± 0.2