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Rudolph, Johann Gottlob, 1725 c.25
Adler Planetarium and Astronomy Museum Arrow right Arrow left
Photo

photo - whole telescope
Basic Info

Maker: Rudolph, Johann Gottlob

Year: 1725 c.25

Year Range: -

Year Notes:

Manufacturing Location: Dresden, Germany

Signature: J.G.'Rudolph fecit Dres[de]n 5

Signature Notes:

Inscriptions:

No stand present.

Collection: Adler Planetarium and Astronomy Museum

Accession #: M-446

Sources:

Project investigation

Public Notes:

Browned vellum main tube and ferrules with blind tooling. Four green vellum draw tubes with faint, diffuse dark decorations. Wooden lens cells, brass slider on eyepiece. Signature is on the objective lens.

Closed telescope length is 550 mm by 62 mm diameter

Length (open):

Length (closed): 550

F-ratio:

Exit pupil:

Object status:

Optical Basics

Objective type: singlet

Optical style

Physical style spyglass

Functional style

Materials: brass, glass, wood, vellum, pasteboard

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 1.95 ± 0.005 0.70 ± 0.005 0.67 ± 0.001 1497.00 ± 3 1.54 ± 0.006 60.00 ± 6
Complete

Eyepieces

Notes:

Additional Photos/Documents