le Père, George, 1744
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Basic Info

Maker: le Père, George

Year: 1744

Year Range: -

Year Notes:

Manufacturing Location: Paris, France

Signature: George le père quai de l’orloge du palais 1744

Signature Notes:


No stand present.

Collection: Adler Planetarium and Astronomy Museum

Accession #: M-442


Project investigation and collection website

Public Notes:

Length (open): 1140 mm

Length (closed): 344 mm by 48 mm diameter


Exit pupil:

Object status:

Optical Basics

Objective type: singlet

Optical style

Physical style spyglass

Functional style

Materials: gold tooling, shagreen, leather, glass, wood, pasteboard, vellum

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 1.15 ± 0.004 867.50 ± 2.7



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 47.10
Lens 2 47.70
Lens 3 39.80