ASTRA OTX2400B Laser Rangefinder User Guide
- May 15, 2024
- ASTRA
Table of Contents
ASTRA OTX2400B Laser Rangefinder
Specifications & Features
- Magnification 6X
- Objective Lens Diameter 21 mm
- Close Focus 6 yards
- Eye Relief 16 mm
- Exit Pupil 3.5 mm
- Field of View 31 .50 ft. at 1 00 yds.
- Water-Resistance Rating IPX4 (Water-Resistant)
- Lens Coating Fully Multi Coated with Rain Repellent
- Housing Material Composite with Rubber Armoring
- Dimensions 4″x 1.44″x 3.11″
- Total Wt. (including battery) 4.25 oz.
- Laser Type 905 nm Class 1 Eye-Safe
- Display Type Red Reflective OLED
- Range Response Time 0.1 seconds
- Battery Type CR-2 3-volt Lithium
- Battery Life Approximately 10,000 Readings
- Laser Range (Reflective) 6-2,400 yds.
- Laser Range (Tree) 6-1,400 yds.
- Laser Range (Deer) 6-950 yds.
- Horizontal (Angle Corrected) Mode Yes
- Angle with Line of Sight Mode Yes
- Archery Mode Yes
- Gun Mode with Ballistics Yes
- Golf Mode Yes
- SCAN Mode Yes
Download the full instruction manual at www.astraoptix.com. For customer service support, email Contact@astraoptix.com
What’s in the Box?
- 6 Power x 21 mm Laser Rangefinder Monocular
- Soft Premium Carry Case
- Microfiber Lens Cleaning Cloth
- Adjustable Neck-style Lanyard
- Astra Optix™ Decal Sticker
- CR-2 3-volt Lithium Battery (Battery Pre-Installed)
- Quick Start Guide
Your Rangefinder at a Glance
Red Reflective OLED
Quick Start
Connect the Battery: Open the Battery Cover and remove the plastic insert from the top of the battery.
Turn on unit and Adjust Eyepiece Diopter Focus: Press the Power (Range) Button to turn on the rangefinder Red Reflective OLED display. Turn the Eyepiece Diopter Focus until both the image in the field of view and Aiming Reticle are clear and focused.
Adjusting the Red OLED Display Brightness: Hold the Mode Button to enter the menu setting, Press the Power Button to cycle between 5 different brightness levels. Press the Mode Button to select.
Brightness Setting
- 1 = Lowest brightness setting
- 5 = Highest brightness setting
NOTE: For some Astra Optix models, the display brightness setting is the
last item in the menu. If the brightness setting is not the first item in the
menu, then press the Mode Button to advance through all the menu items until
you see the brightness setting.
Measuring Distance: Aim the Aiming Reticle on the object you want to
range and press the Power Button to display the distance. Your unit factory
default setting is the Horizontal (Angle Corrected) Mode.
The Line of Sight (LOS) value is displayed at the top of the display for 2
seconds.
The angle-corrected Horizontal Distance ( H) value is displayed at the bottom of the display for up to 8 seconds or until you take a new measurement.
Menu Settings – Button peration Summary
Menu Settings – Menu Operation Summary
- Distance Units Selection
- YIM
- Standard Mode (Std)
- Horizontal (Angle Corrected) with Line of Sight
- Angle with Line of Sight
- OFF (Only Line of Sight)
- Archery Mode (ArCH)
- Golf Mode
- Gun Mode with Ballistics
- Bullet Drop Units Selection: IN, CM, MOA OR MIL
- Ballistics Group & Zero Distance (100yd or 200yd) Selection
- Brightness Setting
- 1 thru 5
Yards & Meters Selection: In the menu press the Power (Range) Button to cycle between Yards (Y) and Meters (M). Press the Mode Button to select.
Select the Operation Mode:
Press the Power Button to cycle between Standard Mode (Std), Archery Mode
(ArCH), Golf Mode or Gun Mode. When the selection you want to use is blinking,
press the Mode Button to select your preferred mode.
Sub-Modes under Standard Mode: Press the Power Button to cycle between each sub-mode. Press the Mode Button to select.
S.S. Gun Mode with Ballistics Selection:
Holdover Units Selection: MOA, MIL, IN, CM – Press the Power Button to
cycle through these selections and press the Mode Button to select.
Ballistic Group Selection and your Zeroed Distance: Select the ballistic
group number that best matches or is similar to the ammunition load you are
using from the Popular Manufacturer’s Loads table on the next page. Press the
Power Button to cycle through 10 available ballistic groups. Each comes with
two zero distance choices. Press the Mode Button to select.
EXAMPLE: If you are zeroed at 100 yards and are using a Hornady .223 Rem.
cartridge with a 40 Grain V-Max bullet (ballistics group 8), you would choose
8-1 in the laser rangefinder menu.
Quick Start
Popular Manufacturer’s Loads
If you do not see your manufacturer’s load in the popular loads table above,
visit www.astraoptix.com to see our complete
Master Ballistics Table with many more factory loads.
NOTE: We recommend you visit a range and confirm that you are sighted in
at one of the possible zero distances (100 yds. or 200 yds.). Then range and
shoot at distances that you will most likely shoot at when in the field. Shoot
according to the suggested holdover value that is displayed to confirm that
you have selected the optimum ballistics group number.
Tips for Using Your Rangefinder
- Your laser rangefinder comes defaulted to the Horizontal (Angle Corrected) with Line of Sight distance mode. For archery or shooting, this mode will give you the angle-corrected shoot-at distance to use. For Archery only, use the Archery Mode (ArCH).
- If you turn off your rangefinder, it will keep the last settings used.
- This rangefinder also has Angle with Line of Sight mode. In this mode, it will display the Line of Sight (LOS) value for 2 seconds at the top of the display followed by the Angle value at the bottom of the screen. Shooters can use this information to calculate holdover using a ballistics calculator.
- If using this rangefinder on the golf course, choose the Golf Mode (GOLF). The Golf Mode will display the nearest distance value (Golf Flagstick) of a group of targets that are within your field of view.
- Under ideal conditions, your Astra Optix™ Laser Rangefinder can measure the distance of reflective objects out to 2,400 yds. It can also measure a deer out to 950 yds. The type of target you are ranging strongly impacts the maximum ranging distance.
- Shiny reflective objects such as metal buildings will range much better than less-reflective objects such as trees, animal fur, bushes or grass.
- Objects that are more dense, such as trees or rock, will range better than bushes or grass.
- Bright-colored objects normally range better than dark-colored objects.
- Rain, fog, snow, bright sunny days and dusty days will reduce the overall ranging performance.
- Cloudy days without fog, snow, rain or dust blowing in the air provide the best ranging conditions.
- Targets that have a flat surface 90° to the laser emitting from the laser rangefinder range better than targets that have a curved surface, or are positioned at an angle in relation to the emitted laser.
- IMPORTANT: The holdover value in the Gun mode is accurate out to 500 yards. This mode should not be used to take long-range shots at distances over 500 yards.
Register your Product
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Warning
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Do not look directly at the sun with your rangefinder, as it could cause serious damage to your eyes.
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Do not aim the rangefinder at a person’s eyes and do not look into the objective-lens side of the product when you are pressing the power button.
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Keep out of reach of small children.
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Only use a CR2 3-volt battery and do not use any outside power source.
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The Gun mode displayed ballistics holdover values and displayed elevation adjustment values are accurate from 15 to 500 yards. If shooting at distances farther
than 500 yards, we suggest using the Angle with Line of Sight mode. Shooters can use the Line of Sight distance value and the Angle value information to calculate
holdover using a ballistics calculator. -
Do not attempt to open or take apart your laser rangefinder, as this will void your lifetime warranty, may damage your product and could cause electric shock.
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Class 1 Laser Product. Product complies with IEC60825-1: Ed. 3: 2014-05 and 21CFR1040. 10/11.
Website: www.astraoptix.com
Email: contact@astraoptix.com
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