Unknown, 1750 c.
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Basic Info

Maker: Unknown

Year: 1750 c.

Year Range: -

Year Notes:

Manufacturing Location: France or England

Signature: Unknown

Signature Notes:

Inscriptions:

No stand present.

Collection: Adler Planetarium and Astronomy Museum

Accession #: M-432

Sources:

Public Notes:

Length (open): 142 mm

Length (closed): 105 mm by 45 mm

F-ratio:

Exit pupil:

Object status:

Optical Basics

Objective type: doublet (crown forward)

Optical style astronomical

Physical style

Functional style

Materials: horn, pasteboard, wood, glass, brass, platinum tooling, silver

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 1.25 163.40 ± 0.5 9.90 31.90
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 29.28 5.60
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 15.53 10.50