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Unknown, French, 1650 c.
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Photo

photo - whole telescope
Basic Info

Maker: Unknown, French

Year: 1650 c.

Year Range: -

Year Notes:

Manufacturing Location: France

Signature:

Signature Notes:

Inscriptions:

No stand present.

Collection: Adler Planetarium and Astronomy Museum

Accession #: M-422

Sources:

Project investigation and collection website

Public Notes:

Imprinted with “A.G.” Main tube is mostly covered with brown leather with fleur-de-lys decorations but has sections at the ends with gold-tooled green vellum. There are Four (?) draw tubes that are also green vellum with gold tooling. As well as, brown leather end caps.

Objective lens is missing.

Length (open): 1235

Length (closed): 365

F-ratio:

Exit pupil:

Object status:

Optical Basics

Objective type: singlet

Optical style

Physical style spyglass

Functional style

Materials: leather, pasteboard, vellum, wood, glass, 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.:
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 50.30
Lens 2 50.50
Lens 3
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 50.50
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
Additional Photos/Documents