Basic Data
| Maker: | Dudley Adams |
| Date (year): | 1800 c. |
| Description: | Adams New Patent Portable Telescope No. 60 Fleet Strt. London |
| Signature: | |
| Collection: | Private Collection |
| Accession #: | A.565 |
| Style: | spyglass |
| Objective type: | doublet - crown forward |
| Notes: | Brass and rosewood, 5 3/4" closed, 30.5" fully extended. Patented in 1800. See Court & von Rohr, Trans. Opt. Soc. 30, 243 (1929) and D. Warner, Rittenhouse Vol. 12, No. 2, p. 43 (1998). |
Objective Data
| Lens 1 |
Lens 2 |
Complete |
| CA curvature (diopters): |
8.599 ± 0.003 |
inaccessible |
|
| CB curvature (diopters): |
inaccessible |
3.331 ± 0.003 |
|
| PD lens power (diopters): |
|
|
1.963 ± 0.003 |
| fD focal length (mm): |
|
|
509.5 ± 0.7 |
| t thickness (mm): |
|
|
7.37 |
| d free aperture (mm): |
|
|
40 |
| nD refractive index: |
|
|
|
| ν Abbe No.: |
|
|
|
Eyepiece Data
| No. of eyepiece elements: | 4 |
(elements of one eyepiece) |
| Lens 1 |
Lens 2 |
Lens 3 |
Lens 4 |
Complete |
| fD focal length (mm): |
|
|
|
|
22.8 |
| 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 |
|
2.6 ± 0.2 |
|
| 2 |
575 |
|
0 |
|
| 3 |
652 |
|
0.2 ± 0.3 |
|
Attached Files (click to enlarge)
This entry, number 37, was created on 2006-08-09 20:48:54 and last modified on 2009-03-03 16:32:06.
