Unknown, 1700 c.
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Photo

photo - whole telescope
Basic Info

Maker: Unknown

Year: 1700 c.

Year Range: -

Year Notes:

Manufacturing Location:

Signature:

Signature Notes:

Inscriptions:

No stand present.

Collection: Coll. Willach

Accession #: 26142

Sources:

Project investigation

Public Notes:

Rare and unusual telescope with a large field of view. Small reverse taper. The first two draws each have lenses on eye-side end (in wooden rings with pressure spring).

Length (open): 650

Length (closed):

F-ratio:

Exit pupil:

Object status:

Optical Basics

Objective type: singlet

Optical style galilean

Physical style

Functional style

Materials: gold tooling, wood, glass, 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 11.00

Eyepieces

Notes: