Pentax ETH-305, ETH-302, ETH-310 instruction manual Eyepiece adjustment

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4.5 Eyepiece adjustment

After [4.4 Centering with the optical plummet] completed, focus the telescope eyepiece on the telescope reticule.

1Remove the telescope lens cap.

2Point the telescope at a bright object.

3Rotate the eyepiece completely counterclockwise.

4Look through the eyepiece, and rotate the eyepiece clockwise until the reticule appears at its maximum sharpness.

Reticule pattern

Horizontal graduation

(double)

Vertical graduation

(single) Optical axis

Vertical graduation

(double)

At procedure 4 , keep your eye relaxed to prevent parallax and eye fatigue. Parallax causes problems with object sighting.

(Refer to [4.6 Object sighting])

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Contents Electronic Theodolites Page Safety Precautions must be followed Distinctive DisplaysPage Contents Contents Precautions BatteryGeneral Storing and environmental conditionsInspection, Adjustment and Repair, Overhaul TransportationStandard Equipment OthersUnpacking and Storing Names of Parts Page Preparation of Power Confirm the correct work by pressing the power switchKeyboard Key Operations and DisplayDisplay Power ON/OFF key Function of each key2 V/% key Page Hold key 4 0SET key 5 R/L key Illumination keyOther Functions Remaining battery indicatorAutomatic Power-off function Special key operations Page Setting of Vertical Angle Setting of 90buzzer Setting of correction of vertical angleSetting of angle measurement Setting of automatic power off function Setting of Angle unitSetting up the instrument Preparation for SurveyingLeveling with the Circular level Leveling with the Plate level Centering with the optical plummet Eyepiece adjustment Object sighting Measurement Horizontal angle measurement rightHorizontal angle measurement left Vertical angle measurement Inspection and Adjustment Instructions on inspection and adjustmentPerpendicularity of plate vial to vertical axis InspectionAdjustment Perpendicularity of circular vial to vertical axis Inclination of reticule graduations Perpendicularity of line of sight to horizontal axis Difference of the vertical angle Optical plummet Optional Accessories Diagonal Eyepiece SB14Specifications TelescopeAngle Measurement Vertical Angle CompensationPower source Water resistant Ambient temperatureDimensions Vertical axisPage Certified