Basic Data
| Maker: | Unsigned |
| Date (year): | 1790 c. |
| Description: | |
| Signature: | |
| Collection: | Adler |
| Accession #: | M-444 |
| Style: | astronomical |
| Objective type: | singlet |
| Notes: | |
Objective Data
| Lens 1 |
| CA curvature (diopters): |
|
| CB curvature (diopters): |
|
| PD lens power (diopters): |
0.999 ± 0.003 |
| fD focal length (mm): |
1001 ± 3 |
| t thickness (mm): |
|
| d free aperture (mm): |
|
| nD refractive index: |
|
| ν Abbe No.: |
|
Eyepiece Data
| No. of eyepiece elements: | 3 |
(elements of one eyepiece) |
| Lens 1 |
Lens 2 |
Lens 3 |
Complete |
| fD focal length (mm): |
61.0 |
53.5 |
47.7 |
55.2 |
| d diameter (mm): |
|
|
|
|
| s spacing (mm): |
|
|
|
|
| CA curvature (diopters): |
|
|
|
|
| CB curvature (diopters): |
|
|
|
|
| M magnification: |
|
|
|
18.1 |
| FOV field of view (degrees): |
|
|
|
|
Attached Files (click to enlarge)
This entry, number 71, was created on 2006-08-14 20:10:04 and last modified on 2006-08-14 20:10:04.
