Maker: Hartsoeker, N.

Year:

Year Range: 1680-1725

Year Notes:

Manufacturing Location: The Netherlands

Signature: N. Hartsoeker 620. 20 Pieds

Signature Notes:

Inscriptions:

No stand present.

Collection: Utrecht University Museum

Accession #: LI-37.03

Sources:

Correspondence w/ curator.

Public Notes:

Lens with engraved inscription. Pretty light / gray glass with some small bubbles. The polish looks good, the surfaces are somewhat scratched. The radii of curvature can be measured with the spherometer difficult precisely the autographed side is almost flat (r | 23m), the other side is convex (r | 4.1m), it follows a focal length of about 6.5m. The ratio of the radii of curvature is about 1:6, with this, the spherical aberration as small as possible.

Length (open):

Length (closed):

F-ratio:

Exit pupil:

Object status:

Objective type: singlet

Optical style

Physical style

Functional style

Materials: glass

Drawtube data:

Drawtube notes:

Objective Data

Eyepieces

Notes: