Unknown, 1650 c.+10
Coll. Willach Arrow right Arrow left

photo - whole telescope
Basic Info

Maker: Unknown

Year: 1650 c.+10

Year Range: -

Year Notes:

Manufacturing Location: Italy


Signature Notes:


No stand present.

Collection: Coll. Willach

Accession #: 16150


Project investigation

Public Notes:

Main draw and tubes are made of wood veneer with small ivory rings, marbled paper, and inverted tooling similar to Adler M-421. Later marbled paper is less fine than mace Ruette. The end rings are ivory. Objective lens is held in by spring, and paper gasket. Objective lens is plane-convex with a diameter of 19 mm and a free aperture of 10 mm, mag. 4x. The ocular is plane-concave.

Length (open): 205

Length (closed): 120


Exit pupil:

Object status:

Optical Basics

Objective type: singlet

Optical style

Physical style

Functional style

Materials: paper, glass, ivory, pasteboard, gold leaf

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 19.00 10.00