Steinheil lens No. 63. Steinheil lens No. 66.
The aplanatic triplets after Steinheil are remarkable for their large, flat field and excellent definition, free from chromatic aberration.
| Diameter Visual field Magnification | ||
| No. 62. | 24 mm 20 mm 8 diam. | $4.— |
| No. 63. | 15 " 15 " 10 " | $4.— |
| No. 64. | 12 " 12 " 12 " | $4.— |
| No. 65. | 10 " 10 " 16 " | $4.— |
| No. 66. | 6 " 3,5 " 20 " | $4.— |
| No. 67. | 5 " 2 " 30 " | $4.— |
| No. 68. | 3 " 1 " 40 " | $4.— |
The achromatic doublets have a very large, clear and flat field.
| No. 69. | 30 mm 35 mm 5 diam. | $4.— |
| No. 70. | 23 " 20 " 8 " | $3.25 |
Doublet magnifier, consisting of two double convex lenses.
| No. 71. | 23 mm 25 mm 6 diam. | $1.25 |
The doublet No. 69 can only be used as a hand lens. The mounting of all the other lenses is such that they fit any of the dissecting stands or lens holders. Aplanatic triplets 64-68 can only be used on stands with rack and pinion adjustment.
