Basic Data
| Maker: | J.G.'Rudolph fecit Dres[de]n |
| Date (year): | 1725 (1700-50) |
| Description: | Browned vellum barrel |
| Signature: | |
| Collection: | Adler |
| Accession #: | M-446 |
| Style: | spyglass |
| Objective type: | singlet |
| Notes: | Browned vellum main tube and ferrules with blind tooling. Four green vellum draw tubes with faint, diffuse dark decorations. Wooden lens cells, brass slider on eyepiece. Signature is on the objective lens. |
Objective Data
| Lens 1 |
| CA curvature (diopters): |
1.948 ± 0.005 |
| CB curvature (diopters): |
0.705 ± 0.005 |
| PD lens power (diopters): |
0.668 ± 0.001 |
| fD focal length (mm): |
1497 ± 3 |
| t thickness (mm): |
|
| d free aperture (mm): |
|
| nD refractive index: |
1.537 ± 0.006 |
| ν Abbe No.: |
60 ± 6 |
Eyepiece Data
| No. of eyepiece elements: | 0 |
(elements of one eyepiece) |
| Complete |
| fD focal length (mm): |
|
| d diameter (mm): |
|
| s spacing (mm): |
|
| CA curvature (diopters): |
|
| CB curvature (diopters): |
|
| M magnification: |
|
| FOV field of view (degrees): |
|
Objective Color Curve Data [(Δf/f)x10-3]
| # |
Wavelength (nm) |
Paraxial |
70% Zone |
Whole Lens |
| 1 |
482 |
|
-10.7 ± 1.5 |
|
| 2 |
575 |
|
0 |
|
| 3 |
652 |
|
6.0 ± 1.2 |
|
Attached Files (click to enlarge)
This entry, number 72, was created on 2006-08-14 20:15:46 and last modified on 2006-09-15 15:53:07.
