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Unknown, 1750 c.50
Adler Planetarium and Astronomy Museum Arrow right Arrow left
Photo

photo - whole telescope
Basic Info

Maker: Unknown

Year: 1750 c.50

Year Range: -

Year Notes:

Manufacturing Location: Italy

Signature:

Signature Notes:

Inscriptions:

No stand present.

Collection: Adler Planetarium and Astronomy Museum

Accession #: M-453

Sources:

Project investigation

Public Notes:

Brown leather covered main tube with gold tooling. Three white vellum draws, brass objective cell with provision for slider (missing). Objective lens is missing(?).

Closed length: 316 mm by 50 mm diameter.

Length (open): 830

Length (closed): 316

F-ratio:

Exit pupil:

Object status:

Optical Basics

Objective type: singlet

Optical style

Physical style spyglass

Functional style

Materials: horn, leather, pasteboard, vellum, wood, glass, brass, gold tooling

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 1.86 -1.86 1.94 515.00 2.24 27.50 1.52
Complete

Eyepieces

Notes:

Eyepiece 1
fD focal length (mm): free aperture (mm): full aperture (mm): s spacing (mm): CA curvature (diopters): CB curvature (diopters): M magnification: FOV field of view (degrees): Thickness:
Lens 1 56.00
Eyepiece 2
fD focal length (mm): free aperture (mm): full aperture (mm): s spacing (mm): CA curvature (diopters): CB curvature (diopters): M magnification: FOV field of view (degrees): Thickness:
Lens 1 57.00
Eyepiece 3
fD focal length (mm): free aperture (mm): full aperture (mm): s spacing (mm): CA curvature (diopters): CB curvature (diopters): M magnification: FOV field of view (degrees): Thickness:
Lens 1 51.60
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