AstrHori 25mm F2.8 2X-5X Ultra Macro Lens for Canon RF Mount User Manual

Introduction

Thank you for choosing the AstrHori 25mm F2.8 2X-5X Ultra Macro Lens. This manual provides essential information for the proper use, setup, and maintenance of your new lens. This lens is designed for full-frame Canon RF mount mirrorless cameras, offering exceptional magnification capabilities for ultra-macro photography.

Image: AstrHori 25mm F2.8 2X-5X Ultra Macro Lens

Key Features

• 2X-5X Magnification: This ultra-macro lens offers a magnification range from 2X to 5X, allowing for detailed close-up photography of small subjects. The working distance is between 37.5mm and 45mm, providing flexibility for lighting and composition.


Image: Examples of 2X to 5X macro magnification.

• High-Definition Image Quality: The optical system comprises 10 elements in 7 groups, including 2 high-refractive index elements and 2 ED elements. This design ensures high-definition image quality, revealing intricate details not visible to the naked eye.


Image: Detail captured with the professional macro lens.

• Enhanced Depth of Field: The 25mm focal length provides a greater depth of field compared to other macro lenses with similar magnification. This reduces the number of images required for depth-of-field stacking, streamlining post-production.


Image: Example of depth of field at 25mm focal length.

• F2.8 Aperture with 8 Blades: Features a maximum aperture of f/2.8 and an 8-blade aperture diaphragm, performing well in various lighting conditions and producing pleasing bokeh. Note that this lens has an aperture ring but no focus ring.


Image: The clicked aperture ring on the lens.

• Full-Frame Compatibility: Designed for full-frame Canon RF mount mirrorless cameras, including models like EOSR, RP, R5, R5C, R6, R7, and R10.

Package Contents

Upon opening the package, please verify that all items are present and in good condition:

• AstrHori 25mm F2.8 2X-5X Ultra Macro Lens
• Front Lens Cap
• Rear Lens Cap
• User Manual

Image: Contents of the product package.

Setup and Installation

Follow these steps to properly attach the AstrHori 25mm F2.8 2X-5X Ultra Macro Lens to your Canon RF mount camera:

1. Ensure your camera is turned off before attaching or detaching any lens.
2. Remove the rear lens cap from the AstrHori macro lens and the body cap from your camera.
3. Align the red dot on the lens barrel with the red dot on your camera's lens mount.
4. Gently insert the lens into the camera mount and rotate it clockwise until it clicks into place. Do not force the lens.
5. Remove the front lens cap. Your lens is now ready for use.

Image: Installation diagram showing lens mounts.

Operating Instructions

The AstrHori 25mm F2.8 2X-5X Ultra Macro Lens is a manual lens, requiring manual adjustment for both magnification and aperture.

Magnification Adjustment

This lens features a magnification ring to adjust between 2X and 5X. Rotate the magnification ring on the lens barrel to achieve your desired level of magnification. The lens does not have a traditional focus ring; focusing is achieved by adjusting the distance between the lens and the subject.

Aperture Control

The aperture is controlled via a dedicated aperture ring on the lens. Rotate this ring to select your desired f-stop (from f/2.8 to f/16). The aperture ring is clicked, providing tactile feedback for each stop.

Working Distance

The optimal working distance for this lens is between 37.5mm and 45mm. Maintain this distance from your subject to achieve sharp focus and optimal image quality. Adjusting the camera's position relative to the subject is crucial for focusing with this lens.

Exposure Settings

Since this is a manual lens, you will need to set your camera to manual exposure mode (M) or aperture priority mode (Av/A) and adjust ISO and shutter speed accordingly to achieve correct exposure. Some cameras may require enabling 'Shoot without lens' or similar settings in their menu.

Maintenance and Care

Proper care will extend the life and performance of your lens:

• Cleaning the Lens: Use a soft, lint-free cloth or a lens brush to remove dust. For smudges or fingerprints, use a specialized lens cleaning solution and a microfiber cloth. Avoid harsh chemicals or abrasive materials.
• Storage: When not in use, always attach the front and rear lens caps. Store the lens in a dry, cool place, away from direct sunlight and extreme temperatures. Consider using a dehumidifying cabinet if you live in a humid environment.
• Handling: Avoid dropping or subjecting the lens to strong impacts. Handle the lens by its barrel, not by the front element.

Troubleshooting

If you encounter issues with your AstrHori 25mm F2.8 2X-5X Ultra Macro Lens, consider the following:

• Image is blurry/out of focus: Ensure you are within the specified working distance (37.5mm-45mm) and have adjusted the camera's position for focus. Check your camera's focus peaking or magnification assist features.
• Images are too dark/bright: Adjust your camera's ISO, shutter speed, and the lens's aperture setting. Ensure your camera is in a manual exposure mode or aperture priority mode.
• Lens not recognized by camera: Verify that the lens is securely mounted. Check your camera's menu for settings like 'Shoot without lens' and enable it if necessary.
• Dust on sensor/lens: Clean the lens elements as described in the Maintenance section. If dust is on the camera sensor, refer to your camera's manual for sensor cleaning procedures or consult a professional.

Specifications

Warranty and Support

For warranty information and technical support, please refer to the documentation included with your purchase or visit the official AstrHori website. Keep your proof of purchase for warranty claims.

If you require further assistance, please contact AstrHori customer service through their official channels.