Mathematisch-Physikalischer Salon / Staatliche Kunstsammlungen Dresden Arrow right Arrow left

photo - whole telescope
Basic Info

Maker: Ramsden


Year Range: -

Year Notes:

Manufacturing Location: London, England

Signature: Ramsden / LONDON / Day or Night

Signature Notes:


No stand present.

Collection: Mathematisch-Physikalischer Salon / Staatliche Kunstsammlungen Dresden

Accession #: CIF 82


Field research.

Public Notes:

Two draws. Says Day or Night but no indication of any changes needed to switch between use. Brass slider stops aperture to 29.

Length (open):

Length (closed):


Exit pupil:

Object status:

Optical Basics

Objective type: doublet (crown forward)

Optical style

Physical style

Functional style


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 7.69 -1.99 2.05 488.42 10.00 29.00



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 1 112.55 6.83
Lens 2 71.47 29.00 120.00 56.34 17.35
Lens 3 76.42 18.50 120.00 2.86 43.56
Lens 4 77.85 25.00 80.00
Lens 5 47.62 19.00 31.19 4.49