The following table gives data pertaining to the Balplan Objectives combined with three types of Eyepieces.
The 10X Wide Field Focusable Eyepiece, Cat. No. 31-15-67, has the same optical characteristics as the 10X Wide Field Eyepiece, Cat. No. 31-15-61, and hasafocusable lens. A Reticle may be installed in the Eyepiece by screwing the lens out, dropping the Reticle onto the Diaphragm, pattern side down, and installing the spring ring on top of the Reticle. Screw the lens in and focus on the Reticle.
a = Total Magnification of Objective/Eyepiece combination.
b = Diameter of Field of View in Specimen Plane, in mm.
c = Eye Relief, in mm.
| OBJECTIVES | EYEPIECES | |||||
|---|---|---|---|---|---|---|
| CAT. NO. | MAGNIFI- CATION | NUMERICAL APERTURE | WORKING DISTANCE | 10X WIDE FIELD CAT. NO. 31-15-61 | 10X HUYGENIAN CAT. NO. 31-05-24 | 15X WIDE FIELD CAT. NO. 31-15-62 |
| 31-12-20 | 2.5X | 0.0625 | 10.0mm | a 25X b 8.0 c 23.5 | 25X 6.0 7.1 |
37.5X 6.7 11.4 |
| 31-12-21 | 4X | 0.09 | 10.2mm | a 40X b 5.0 c 23.7 | 40X 3.75 7.1 |
60X 4.2 11.5 |
| 31-12-22 | 10X | 0.25 | 3.35mm | a 100X b 2.0 c 23.7 | 100X 0.75 7.2 |
150X 1.7 11.6 |
| 31-12-23 | 20X | 0.50 | 0.79mm | a 200X b 1.0 c 23.7 | 200X 0.75 7.1 |
300X 0.84 11.5 |
| 31-12-24 | 40X | 0.65 | 0.56mm | a 400X b 0.5 c 23.7 | 400X 0.38 7.0 |
600X 0.42 11.5 |
| 31-12-26 | 100X | 1.25 | 0.14mm | a 1000X b 0.2 c 23.5 | 1000X 0.15 6.9 |
1500X 0.17 11.4 |