Test eyepieces and lenses
The 7101 is primarily used to check the range and establish the "zero" setting of focusing eyepieces for optical products such as binoculars, rangefinder microscopes, theodolites, spectrometers, telescopes, etc. It may be used for measuring the power of a lens (within range), measuring field curvature of a lens, determining the range of focusing eyepiece, and measuring astigmatism of a telescope.
The 7101 has a range of 9 diopters (from +4 to ˆ’5). Its scale is calibrated in major numbered divisions of whole diopters, with the smallest divisions equal to 0.2 diopters. Estimates to 0.1 diopter are easily and accurately made.
| Aperture Diameter mm | 13 |
|---|---|
| Diameter in | 1-3/8" |
| Diameter mm | 34.9 mm |
| Diameter of Exit Pupil | 4-1/4 mm |
| Field of View | 12°, 40? (12.2 m) |
| Graduations | Smallest division 0.2 diopters, with whole diopters numbered |
| Length in | 3.5 |
| Length Accuracy | 3-1/2” (89 mm) |
| Magnification | 3x |
| Min Height | 8" |
| Weight, Product (Approx.) lb | 1.5 |
| Weight, Product (Approx.) kg | 0.7 |
| Zero Setting | At infinity (for perfectly collimated light) |
