Davidson Optronics D-271 Autocollimating Alignment Telescope

Davidson Optronics D-271 Autocollimating Alignment Telescope

This Davidson Optronics D-271 Autocollimating Alignment Telescope is used and in excellent condition. This unit comes in the original wooden case, (2) extra bulbs, and an extra eyepiece included.

Model: D-271
Focusing Range: 6" to infinity (focusing knob)
Field: 3/4" at 1 foot, 3.5" at 5 feet, 12.0" at 15 feet
Nulling Repeatability: ±0.5 Arc Seconds or Better
Measuring Range: 1° at 1 ft and ±10 arc minutes at 5 ft
Autocollimating: Projects center dot with 1 arc minute ring graduations (± 30 arc minutes)
Alignment: Cross hairs with 0.0005" wide lines

View Photo of original wooden case, (2) extra bulbs, and an extra eyepiece.

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Stock # 62453-5
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Davidson Optronics D-271 Autocollimating Alignment Telescope

  • Compact
  • Autocollimating Feature
  • Easy Mechanical Fixturing


The Model D-271 is primarily an alignment telescope, which means that the optical line of sight of the telescope at any distance is an accurate extension of the axis of the outside cylindrical barrel or tube of the telescope. The telescope focuses from 6 inches to infinity.

In addition, the Model D-271 has an autocollimating feature that permits it to be used as an autocollimator. The light source sends a beam of light out of the objective in the form of parallel or infinite rays of light. When these light rays are reflected by a tilted mirror the angle through which the reflected beam is turned equals to twice the tilted mirror angle. However, the Model D-271 has a built-in compansating factor that permits reading the exact angle of the mirror tilt. Specifically, if the mirror is tilted 1 arc minute, what the telescope reads is 1 arc minute instead of 2 arc minutes. The Model D-271 comes complete with power pack and carrying case.

Product Family: D271, D-271, D 271, Davidson D217, Davidson D-271, Davidson D 271

Important Notice: Please note that any additional items included with this equipment such as accessories, manuals, cables, calibration data, software, etc. are specifically listed in the above stock item description and/or displayed in the photos of the equipment. Please contact one of our Customer Support Specialists if you have any questions about what is included with this equipment or if you require any additional information.

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Davidson Optronics D-271 Autocollimating Alignment Telescope

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