SVBONY SV152 20mm Illuminated Reticle Eyepiece Instruction Manual

1. Introduction

The SVBONY SV152 20mm Illuminated Reticle Eyepiece is designed for precise alignment and guiding in astronomical observations and astrophotography. Featuring a 1.25-inch barrel, a 70-degree apparent field of view, and an illuminated crosshair, this eyepiece assists in accurate centering of celestial objects and polar alignment.

2. Package Contents

Verify that all items listed below are included in your package:

• 1x SVBONY SV152 1.25" SWA 70-Degree F20mm Eyepiece
• 1x LED Illuminator Module
• 2x Rubber Eyepiece Caps
• 1x Mirror Cleaning Cloth
• 2x 1.5V Button Cells (LR44 type)

3. Product Features

• Illuminated Crosshair: Features a precisely located red crosshair in the center of the field of view for accurate guiding and alignment.
• Wide Field of View: A 70-degree apparent field of view facilitates easy acquisition and centering of target objects.
• Adjustable Brightness: The illuminator module allows for brightness adjustment, conserving battery life at lower settings.
• Comfortable Eye Relief: Designed with 16mm eye relief for comfortable viewing, even for users wearing glasses.
• Fully Multi-Coated Optics: Broadband green coatings enhance light transmission, contrast, and clarity.
• Standard Compatibility: Equipped with a standard 1.25-inch barrel and filter thread (M28.5*0.6) for compatibility with various telescope accessories.
• Durable Construction: Features a durable metal body and internal threading to suppress stray light reflections.

4. Setup

4.1 Installing the Illuminator Battery

The illuminator module requires two 1.5V button cell batteries (LR44 type) for operation. Follow these steps to install them:

1. Unscrew the operating handle from the illuminator module.
2. Remove any plastic washer or protective film if present.
3. Insert two 1.5V button cell batteries, ensuring correct polarity (typically positive side facing the spring).
4. Screw the operating handle back onto the illuminator module.

4.2 Attaching the Illuminator Module

The illuminator module screws into the side port of the eyepiece body. Ensure it is securely fastened but do not overtighten.

4.3 Inserting the Eyepiece into a Telescope or Guide Scope

Insert the 1.25-inch barrel of the SV152 eyepiece into the focuser of your telescope or guide scope. Secure it with the focuser's thumbscrew. Ensure it is seated properly for stable viewing.

5. Operating Instructions

5.1 Focusing the Eyepiece

Adjust the focuser of your telescope or guide scope until the celestial object and the crosshairs appear sharp and clear. The eyepiece itself has a focus mechanism for the reticle; rotate the eyepiece body to bring the crosshairs into sharp focus for your eye.

5.2 Adjusting Crosshair Brightness

To activate the illuminated crosshair, turn the knob on the illuminator module. Continue turning to adjust the brightness level. Turn the knob until the crosshair is visible but not overly bright, which could obscure faint objects. Turn it off when not in use to conserve battery life.

5.3 Using for Guiding and Alignment

The illuminated crosshair is particularly useful for:

• Polar Alignment: Aligning your equatorial mount with the celestial pole.
• Go-To System Alignment: Precisely centering alignment stars for computerized telescope mounts.
• Manual Guiding: Keeping a guide star centered during long-exposure astrophotography.

The wide 70-degree field of view helps in easily locating guide stars, while the precise crosshair ensures accurate centering.

6. Maintenance

6.1 Cleaning the Optics

To clean the eyepiece lenses:

1. Gently brush off any loose dust with a soft lens brush or compressed air.
2. Apply a few drops of optical cleaning fluid to a clean microfiber cloth (like the one provided).
3. Wipe the lens surface in a circular motion, starting from the center and moving outwards.
4. Avoid touching the lens surfaces with bare fingers.

Caution: Do not use abrasive cloths, paper towels, or harsh chemicals, as these can scratch or damage the lens coatings.

6.2 Storage

When not in use, always replace the protective rubber caps on both ends of the eyepiece. Store the eyepiece in a clean, dry environment, preferably in its original packaging or a dedicated eyepiece case, to protect it from dust, moisture, and impacts. Remove the batteries from the illuminator module if storing for extended periods to prevent leakage.

7. Troubleshooting

7.1 Illuminator Not Working

• Check Batteries: Ensure the 1.5V button cell batteries are correctly installed with the proper polarity and are not depleted. Replace if necessary.
• Check Connections: Verify that the illuminator module is securely screwed into the eyepiece body.
• Inspect Contacts: Occasionally, battery contacts may become oxidized or misaligned. Gently clean the contacts with a cotton swab and rubbing alcohol, or carefully adjust them if they appear bent.

7.2 Crosshairs Out of Focus

• Adjust Eyepiece Focus: The reticle itself can be focused independently. Rotate the upper part of the eyepiece body to bring the crosshairs into sharp focus for your individual eyesight.
• Adjust Telescope Focuser: Ensure the main telescope or guide scope focuser is adjusted to bring the celestial object into sharp focus.

7.3 Dim or Uneven Illumination

• Adjust Brightness Knob: Turn the brightness knob on the illuminator module to increase the intensity.
• Replace Batteries: Dim illumination often indicates low battery power.

8. Specifications

9. Warranty and Support

SVBONY products are typically covered by a limited warranty against defects in materials and workmanship. For specific warranty details, return policies, or technical support, please refer to the official SVBONY website or contact their customer service directly. Keep your purchase receipt as proof of purchase for warranty claims.

For further assistance, visit the SVBONY Store on Amazon.