Unknown, 1750 c.
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Basic Info

Maker: Unknown

Year: 1750 c.

Year Range: -

Year Notes:

Manufacturing Location:

Signature:

Signature Notes:

Inscriptions:

No stand present.

Collection: Adler Planetarium and Astronomy Museum

Accession #: M-433

Sources:

Public Notes:

Length (open):

Length (closed):

F-ratio:

Exit pupil:

Object status:

Optical Basics

Objective type: singlet

Optical style

Physical style spyglass

Functional style

Materials:

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 15.47 8.26 ± 0.02 121.10 ± 0.3 2.30 1.53
Complete

Eyepieces

Notes: