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Unknown, English, 1700 c.25
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Photo

photo - whole telescope
Basic Info

Maker: Unknown, English

Year: 1700 c.25

Year Range: -

Year Notes:

Manufacturing Location: England

Signature:

Signature Notes:

Inscriptions:

No stand present.

Collection: Adler Planetarium and Astronomy Museum

Accession #: M-451

Sources:

Public Notes:

Main tube and ferrules covered in green vellum with a small amount of tooling. Five white vellum draws. Wooden lens cells on both ends with brass section for sliders. The objective cap slider is missing.

Closed telescope measures 462 mm in length with a 45 mm diameter.

Length (open): 1473

Length (closed): 462

F-ratio:

Exit pupil:

Object status:

Optical Basics

Objective type: singlet

Optical style

Physical style spyglass

Functional style

Materials: wood, vellum, pasteboard, brass, glass

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 64.20
Lens 2 67.40
Lens 3 38.10
Lens 4 65.70
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 38.10
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 65.70
Additional Photos/Documents