Unknown, 1680 c.+10
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Photo

photo - whole telescope
Basic Info

Maker: Unknown

Year: 1680 c.+10

Year Range: -

Year Notes:

Manufacturing Location: Italy or France

Signature:

Signature Notes:

Inscriptions:

No stand present.

Collection: Adler Planetarium and Astronomy Museum

Accession #: M-428a

Sources:

Project investigation

Public Notes:

Large diameter main barrel and ferrules covered with brown parchment tooled in gold. Parchment is badly chipped. Eight draw tubes covered with combed marbled paper. Wooden objective cap. The 83 mm diameter lens is pale yellowish in color and has beveled edges.

Length (open): 5000

Length (closed):

F-ratio:

Exit pupil:

Object status:

Optical Basics

Objective type: singlet

Optical style

Physical style spyglass

Functional style

Materials: glass, pasteboard, vellum, wood

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 0.18 ± 0.0014 -0.18 ± 0.0014 0.17 5728.00 82.00 1.49
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
Lens 2
Lens 3 81.00
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
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 81.00