photo - whole telescope

Maker: Anian

Year: 1691

Year Range: -

Year Notes:

Manufacturing Location: Paris, France

Signature: PAR LE P. ANIAN DE / PARIS CAPVCIN 1691

Signature Notes:

Inscriptions:

Stand present.

Collection: Coll. Willach

Accession #: RW 182 [16182] [2008 02] [2023]]

Sources:

Willach, "The development of the binocular telescope in the 17th and 18th centuries." Project investigation.

Public Notes:

Surprisingly light, reverse taper; fine focusing with eye-side tubes. Same dimension and gold embossing as instruments in Hannover and Gottingen collections. Signature on main box. Objective focal length 850 mm for each. Three lens ocular focal length is 51 mm each. Roughly 17x magnification. Gives a very sharp image. Each draw has a diaphragm plate, with two tube holes at, fixed in place at eye-side end of draw. Providing internal stability for the draw box. A knotted cord running through the center of this plate prevents this instrument from being over extended.

Length (open): 1130

Length (closed):

F-ratio:

Exit pupil:

Object status:

Objective type: doublet (unknown)

Optical style

Physical style binocular

Functional style

Materials: gold tooling, parchment, wood, glass

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			1.18	850.00			21.00
Lens 2			1.18	850.00			21.00

Eyepieces

Notes:

Willach_1.pdf

Willach_2.pdf