Sterrop, Unknown
Mathematisch-Physikalischer Salon / Staatliche Kunstsammlungen Dresden Arrow right Arrow left

photo - whole telescope
Basic Info

Maker: Sterrop

Year: Unknown

Year Range: -

Year Notes:

Manufacturing Location: England [unconfirmed]


Signature Notes:


No stand present.

Collection: Mathematisch-Physikalischer Salon / Staatliche Kunstsammlungen Dresden

Accession #:


Project investigation.

Public Notes:

One objective is missing. Double extension marks show they differ in length by about 275 mm. Photographed in objective position. If like Willach Asycough revolver, then surviving objective is long. Screw is missing to indicate proper position and which lens is being used.

Length (open):

Length (closed):


Exit pupil:

Object status:

Optical Basics

Objective type: singlet

Optical style terrestrial

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 0.85 0.00 976.90 24.00



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 59.85 16.32
Lens 2 167.10 29.00 110.00 4.90 6.55
Lens 3 73.00 25.00 65.00 13.13 13.16
Lens 4 75.60 25.00 80.00 13.18 13.10
Lens 5 67.00 65.00 14.32 14.37
Lens 6 40.12 19.00