SVBONY MK90 Telescope User Manual

1. Introduction

This manual provides detailed instructions for the setup, operation, and maintenance of your SVBONY MK90 Maksutov-Cassegrain Telescope bundle. This bundle includes the MK90 telescope, the SV231 1.25'' Color Correction Filter, and the SV705C Telescope Camera. Please read this manual thoroughly before using your equipment to ensure optimal performance and longevity.

2. Product Overview

2.1 SVBONY MK90 Maksutov-Cassegrain Telescope

The MK90 is a compact and portable catadioptric telescope featuring a 90mm aperture and 1250mm focal length. Its Maksutov-Cassegrain design utilizes a convex meniscus lens, which enhances contrast and eliminates the need for periodic collimation, simplifying maintenance. The telescope is designed for ease of use, with pre-aligned optics from the factory.

Figure 2.1: The SVBONY MK90 telescope, highlighting its portable and lightweight design with dimensions of 90mm diameter, 290mm length, and 1.3kg weight.

Figure 2.2: Internal design of the MK90 telescope, illustrating the primary and secondary mirrors, both coated with precision aluminum layers featuring multi-layer deposition for enhanced optical performance.

2.2 SV231 1.25'' Color Correction Filter

The SV231 filter is designed to correct chromatic aberration and color unevenness, particularly in the blue spectral range. It improves image quality by minimizing blue wavelengths in out-of-focus areas and enhancing color saturation and contrast. The filter has an optical density greater than 4, effectively blocking light pollution and reducing noise.

Figure 2.3: The SV231 Color Correction Filter, demonstrating its ability to improve the contrast and clarity of celestial objects, as shown in the 'Before' and 'After' images of Saturn.

Figure 2.4: The SV231 filter's effectiveness in blocking light pollution and reducing noise, illustrated by 'Before' and 'After' images of the Moon, showing enhanced detail and reduced haze.

2.3 SV705C Telescope Camera

The SV705C camera is versatile, suitable for planetary imaging, Electronically Assisted Astronomy (EAA), lucky imaging, and entry-level deep-sky photography. It features an IMX585 sensor with a high signal-to-noise ratio and three times the full well charges compared to the IMX485 sensor, improving shooting efficiency and image quality.

Figure 2.5: Key components of the SV705C camera, including the USB3.0 interface for data transfer, ST4 guiding port for autoguiding, 1/4 thread interface for mounting, and an AR coating protective window.

Figure 2.6: The SV705C camera's IMX585 high-sensitive sensor, detailing its specifications including 3856x2180 resolution and 128MB DDR3 memory for efficient image processing.

3. Package Contents

Your SVBONY MK90 Telescope bundle typically includes the following items:

• SVBONY MK90 Maksutov-Cassegrain Telescope Optical Tube
• SV231 1.25'' Color Correction Filter
• SV705C Telescope Camera
• Dust caps for telescope and camera
• Necessary cables for camera connection (e.g., USB3.0 cable)
• User Manual (this document)

Note: Specific accessories such as eyepieces, diagonals, or mounts may be sold separately or included depending on the specific bundle purchased. Please refer to your product packaging for a complete list of included items.

4. Setup Guide

4.1 Mounting the MK90 Telescope

1. Prepare your mount: Ensure your altazimuth mount (or other compatible mount) is stable and level.
2. Attach the telescope: The MK90 features a Vixen-style dovetail design. Slide the telescope's dovetail bar into the saddle of your mount.
3. Secure the telescope: Tighten the fixation screws on your mount to firmly hold the telescope in place. The MK90 is designed for instant readiness, with its optical axis precisely aligned at the factory, requiring no additional manual alignment.

Figure 4.1: The rear of the MK90 telescope, illustrating the three fixation screws and three pairs of calibration screws that ensure the optical axis is precisely aligned and ready for immediate use.

4.2 Installing the SV231 Color Correction Filter

The SV231 filter is designed to be threaded into 1.25-inch eyepieces or camera adapters.

1. Identify the thread: Locate the filter threads on your 1.25-inch eyepiece barrel or camera nosepiece.
2. Screw in the filter: Carefully thread the SV231 filter into the eyepiece or camera nosepiece until it is snug. Do not overtighten.
3. Insert into diagonal/focuser: Insert the eyepiece or camera (with the filter attached) into the telescope's diagonal or focuser.

4.3 Connecting the SV705C Telescope Camera

1. Attach to telescope: Insert the SV705C camera's nosepiece into the telescope's focuser or a compatible diagonal. Secure it with the focuser's thumbscrews.
2. Connect USB cable: Plug one end of the provided USB3.0 cable into the camera's USB3.0 interface and the other end into your computer's USB3.0 port.
3. Install software: Install the necessary camera control software and drivers on your computer. Refer to the SVBONY website or the camera's specific documentation for software downloads and installation instructions.
4. (Optional) Connect ST4 guiding cable: If using an autoguider, connect an ST4 guiding cable from the camera's ST4 Guiding Port to your mount's autoguiding port.

5. Operation

5.1 Focusing the Telescope

The MK90 features an internal focusing mount system.

1. Point the telescope: Aim your telescope at a distant object (for terrestrial viewing) or a bright celestial object (for astronomical viewing).
2. Adjust the focus knob: Rotate the focus knob, typically located at the rear of the telescope, until the image appears sharp and clear. Turn slowly to achieve fine focus.

Figure 5.1: The MK90's internal focusing mount system, illustrating the focus knob and its effect on image clarity, with examples of an out-of-focus and a sharply focused celestial body.

5.2 Using the SV231 Color Correction Filter

Once installed, the SV231 filter automatically works to improve your viewing or imaging experience. It is particularly effective for:

• Planetary Observation: Enhances contrast and color fidelity of planets by reducing chromatic aberration.
• Lunar Observation: Reduces glare and improves detail by blocking unwanted light pollution.
• General Viewing: Can improve overall image clarity and reduce color fringing in various astronomical targets.

5.3 Operating the SV705C Telescope Camera

After connecting the camera to your computer and installing the necessary software:

1. Launch software: Open your chosen camera control software (e.g., SharpCap, ASCOM-compatible software).
2. Select camera: Select the SV705C camera from the list of available devices within the software.
3. Adjust settings: Configure exposure time, gain, and other imaging parameters as needed for your target object.
4. Capture images/video: Begin capturing still images or video sequences. The IMX585 sensor's high sensitivity and signal-to-noise ratio are beneficial for capturing detailed planetary and lunar images, as well as for EAA and lucky imaging techniques.

6. Maintenance and Care

6.1 Cleaning Optics

Proper care of optical surfaces is crucial for maintaining image quality.

• Dust removal: Use a soft brush or a can of compressed air (held upright to prevent propellant discharge) to gently remove loose dust from lenses and mirrors.
• Fingerprints/Smudges: For stubborn marks, use a specialized optical cleaning solution and a clean, soft microfiber cloth. Apply a small amount of solution to the cloth, not directly to the lens, and wipe gently in a circular motion from the center outwards.
• Avoid harsh chemicals: Never use household cleaners or abrasive materials on optical surfaces.

6.2 Storage

When not in use, store your telescope and accessories in a clean, dry, and dust-free environment.

• Use dust caps: Always place dust caps on the front of the telescope, focuser, and camera to prevent dust accumulation.
• Original packaging: If possible, store the equipment in its original foam-lined box or a dedicated carrying case.
• Humidity: Avoid storing in areas with high humidity to prevent mold growth on optics. Consider using desiccant packets if humidity is a concern.

7. Troubleshooting

7.1 Blurry Images

• Check focus: Ensure the telescope is properly focused using the focus knob.
• Atmospheric conditions: Hazy skies or heat currents can cause blurring. Wait for stable atmospheric conditions.
• Eyepiece/Camera seating: Ensure eyepieces or cameras are fully inserted and secured in the focuser.

7.2 No Image Through Camera

• Software connection: Verify the camera is correctly selected and connected in your imaging software.
• USB connection: Ensure the USB cable is securely connected to both the camera and the computer. Try a different USB port.
• Exposure settings: Check that exposure time and gain settings in the software are appropriate for the target object.
• Dust cap: Confirm the telescope's dust cap has been removed.

7.3 Color Fringing/Aberration

• SV231 Filter: Ensure the SV231 Color Correction Filter is properly installed. This filter is specifically designed to mitigate chromatic aberration.
• Atmospheric Dispersion: Low-altitude objects can exhibit atmospheric dispersion. This is a natural phenomenon and not a telescope defect.

8. Specifications

9. Warranty and Support

For warranty information, technical support, or service inquiries, please refer to the official SVBONY website or contact SVBONY customer service directly. Details regarding warranty periods and terms are typically provided with your product packaging or on the manufacturer's website.

SVBONY Official Website: www.svbony.com