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Test eyepieces and lenses |
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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 −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.
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Diameter: 1 3/8" (34.9mm)
Length (closed): 3 ½" (89mm)
Length under working conditions: 3½" (89mm)
Field of view: 12°, 40' (12.2m)
Aperture: 13 mm
Diameter of exit pupil: 4 ¼ mm |
Magnification: 3x
Minimum Focus: 8"
Range: 9 diopters, from +4 to -5.
Graduations: Smallest division 0.2 diopters,
with whole diopters numbered.
Zero setting: At infinity (for perfectly
collimated light).
Weight: approx. 1½ lbs. (0.7 kg) |
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