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Baillou, François, 1738
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Photo

photo - whole telescope
Basic Info

Maker: Baillou, François

Year: 1738

Year Range: -

Year Notes:

Manufacturing Location: France [unconfirmed]

Signature: Franciscus Baillou fecit Mediolani anno 1738

Signature Notes:

Inscriptions:

No stand present.

Collection: Adler Planetarium and Astronomy Museum

Accession #: M-131

Sources:

Public Notes:

Brown leather covered main barrel with gold tooling. Seven draw tubes are covered with marbled paper with a marbled smear pattern. Brass ferrules, ivory cells for both objective and eyepiece with ivory caps. Signature scratched on the lens.

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 1.17 ± 0.003 -0.01 ± 0.003 0.62 1600.00 0.70 31.50 1.53
Complete

Eyepieces

Notes:

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 58.40
Eyepiece 2
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 51.80
Eyepiece 3
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 52.60
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