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Product Guides and Instruction Manual Downloads
You can download them from the links below.
AstrHori
⚠️ Before Updating Firmware
Before performing an update, please be sure to read the instruction manual or the notes below and follow the correct procedures.
Please note that updating using an incorrect method may cause the product to malfunction.
AstrHori AF 85mm F1.8 II
Sony E-mount
*Latest firmware (as of 3/31/2026)
【Update Details】
- Improved compatibility and adaptability with camera bodies
- Optimized overall lens operational stability
- Fixed known issues to provide a more comfortable user experience
Nikon Z-mount
*Latest firmware (as of 3/31/2026)
【Update Details】
- Improved exposure accuracy in specific shooting scenes on certain models
- Improved smoothness of aperture adjustment operations on the camera body
- Optimized focus response when using the focus ring on certain models
- Improved compatibility with certain models
- Fixed known issues and improved overall stability
Leica L-mount
*Latest firmware (as of 3/31/2026)
【Update Details】
- Improved compatibility with camera bodies
AstrHori AF 27mm F2.8 STM
Sony E-mount
*Latest firmware (as of 3/31/2026)
【Update Details】
- Improved compatibility with camera bodies
Nikon Z-mount
*Latest firmware (as of 3/31/2026)
【Update Details】
- Improved exposure accuracy in specific shooting scenes on certain models
- Improved smoothness of aperture adjustment operations on the camera body
- Optimized focus response when using the focus ring on certain models
- Improved compatibility with certain models
- Fixed known issues and improved overall stability
AstrHori Light Meter XH-2
(Equipped with OLED display, USB rechargeable)
SG-image
⚠️ Before Updating Firmware
Before performing an update, please be sure to read the instruction manual or the notes below and follow the correct procedures.
Please note that updating using an incorrect method may cause the product to malfunction.
SG-image AF 55mm F1.8 STM
Nikon Z-mount
【Update Details】
- Fixed the issue on Z50II, Zf, and Zfc where the lens would switch to MF upon waking from standby and could not be switched back to AF.
- Fixed the issue on Z6III where focus speed would slow down after repeated focus adjustments via touch operation in AF-C mode.
- Fixed the issue on Z8 where exposure would become incorrect when shooting at small apertures while using maximum aperture control (Iv function).
SG-image AF 35mm F2.2 (Common to Classic Edition)
Sony E-mount
*Latest firmware (as of 8/10/2026)
【Update Details】
- Added support for Sony α7R VI and optimized focus stroke.
SG-image AF 25mm F1.8 (Common to type II)
Sony E-mount
*Latest firmware (as of 3/13/2026)
*After a successful update, the SoftwareVersion will be displayed as v.12
【Update Details】
- Optimized lens distortion correction
View previous versions
Update details: Changed EXIF information to "SG-image 25mm F1.8 E"
Update details: Optimized focus issues during video recording after AF activation on certain cameras
Fujifilm X-mount
*Latest firmware (as of 3/13/2026)
【Update Details】
- Optimized lens distortion correction
View previous versions
Update details:
・Improved focus stability
・Improved communication stability
Update details:
・Focal length adjustment
・Optimized AF performance
・Improved stability
Nikon Z-mount
*Latest firmware (as of 11/26/2025)
【Update Details】
- Optimized AF stability
- Fixed issue where some cameras would not enter sleep mode
Micro Four Thirds
*Latest firmware (as of 8/3/2026)
【Update Details】
- Improved AF (Autofocus) speed
- Fixed an issue where continuous AF (AF-C) might not work correctly during video recording on some models
Viltrox
VILTROX TELECONVERTER 2.0x
VILTROX TELECONVERTER 2.0x compatible lens list