German Moller-Wedel Diopter telescope / Dioptometer in original box. +/- 5 dpt

Description

This German Moller-Wedel Diopter Telescope or Dioptometer is a focusing telescope measuring the power of lenses in diopters. This Dioptometer is in good working condition.

Technical Specifications:

• Type: DPT -5/+5
• Focal length: 40mm
• Field of view: 13
• Height: 75-92mm
• Measuring range: -5 to +5 Diopter
• Graduation: 0.1 Diopter

Applications:

• Testing diopter graduation, focusing range and infinity (“zero”) setting of eyepieces
• Measurement of power of lenses
• Testing the astigmatism of telescopes
• Measuring the field curvature of lens

Key Features:

• The supporting flange of the Dioptometer is square (45mm x 45mm) and removable. After removing the flange,  the  connection thread M 38×1 mm can be used to attach the Dioptometer to custom holders or other devices.
• The size of the smallest division is important for accurate reading. This Dioptometer has large graduations and permit easy reading and accurate estimation at half of the smallest division.

Operation steps:

• The eyepiece of the Diopter Telescope is rotated until its reticle is seen sharp and clear. The focusing ring is set to zero.
• The Diopter Telescope is placed with its supporting flange on the eyepiece or the telescope under test. The eyepiece of the telescope under test is rotated until its reticle is seen sharp and clear. This is the zero setting of the eyepiece.
• Further measurements are made by rotating the eye-piece under test to the next graduation and focusing the Dioptometer correspondingly. The reading is done directly on the diopter graduated scale.

Please see photos for further details.