Unknown, 1690
Mathematisch-Physikalischer Salon / Staatliche Kunstsammlungen Dresden Arrow right Arrow left
Photo

photo - whole telescope
Basic Info

Maker: Unknown

Year: 1690

Year Range: -

Year Notes:

Manufacturing Location: Unknown

Signature:

Signature Notes:

Inscriptions:

No stand present.

Collection: Mathematisch-Physikalischer Salon / Staatliche Kunstsammlungen Dresden

Accession #: CIF 63

Sources:

Helmut Schramm, Astronomische Instrumente Katalogue, Staatlicher Mathematisch-Physikalischer Salon, Dresden, Zwinger, item 6, pg. 15. Field research.

Public Notes:

Objective is heavily stopped down with green paper stop. Ronchigram shows central portion has defects, rendering image problematic.

6 draws. Draws are covered with swirling, linear patterns.

From catalogue: Tubes of paper. Objective tube with cover of red parchment, end-ring with cover of same. Faded staining. Ornamentation of gold-leaf. Inner tubes with cover of red-brown "flame paper" (known as Moravian paste-paper). Objective and ocular diagrams of dark brown wood. Lens in two-piece screw-type with additional male threaded connection. Objective lens concave-convex with outer diameter 61.6-61.7 mm (circumference not perfectly circular). Inner-diameter of opening of lens mount 50mm. Diameter of aperture 24.6 mm, focal length 1739 mm. Mag 29x.

Length (open): 2335

Length (closed): 720

F-ratio:

Exit pupil:

Object status:

Optical Basics

Objective type: singlet

Optical style

Physical style

Functional style

Materials: paper, parchment, wood, 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.:
Lens 1 1.53 0.54 1870.40 25.00
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 60.75 30.79
Lens 2 94.34 25.00 200.00 10.21 10.23
Lens 3 200.00
Lens 4 60.35 22.00 11.54 20.82
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 60.35 22.00 11.54 20.83