Modchip solution for old Sigma EOS lenses - fixes ERR01 (firmware incompatibility)

Do you own an old Sigma lens for Canon film cameras and want to reuse it with a modern DSLR?

If your old Sigma lens from the film era throws Error 01 on a modern Canon DSLR when shooting, this modchip is the solution.

Simply solder this tiny flexible PCB on top of the bayonet contacts as shown in the video, and your lens will work seamlessly with any modern Canon camera!

https://www.youtube.com/watch?v=r8hK0px8Ctk

Compatible Lens Models (some models may be missing here)

• Sigma 24-70mm f/3.5-5.6 Aspherical UC
• Sigma 28-80mm f/3.5-5.6 Mini Zoom Macro Aspherical
• Sigma 28-80mm f/3.5-5.6 Mini Zoom Macro Aspherical HF
• Sigma 28-80mm f/3.5-5.6 Mini Zoom Macro II Aspherical
• Sigma 28-105mm f/2.8-4 Aspherical
• Sigma 28-105mm f/3.8-5.6 UC-III Aspherical IF
• Sigma 28-135mm f/3.8-5.6 Aspherical IF Macro
• Sigma 28-200mm f/3.5-5.6 DL Aspherical IF Hyperzoom Macro
• Sigma 28-300mm f/3.5-6.3 DL Aspherical IF Hyperzoom
• Sigma 70-210mm f/4-5.6 UC-II
• Sigma 70-300mm f/4-5.6 APO Macro Super
• Sigma 70-300mm f/4-5.6 DL Macro Super
• Sigma 100-300mm f/4.5-6.7 DL
• Sigma 135-400mm f/4.5-5.6 APO Aspherical RF
• Sigma 170-500mm f/5-6.3 APO Aspherical RF
• Sigma 8mm f/4 EX Circular Fisheye
• Sigma 15mm f/2.8 EX Diagonal Fisheye
• Sigma 24mm f/2.8
• Sigma 28mm f/1.8 II Aspherical
• Sigma 90mm f/2.8 Macro
• Sigma 50mm f/2.8 EX Macro
• Sigma 105mm f/2.8 EX Macro
• Sigma 300mm f/4 APO Tele Macro
• Sigma 400mm f/5.6 APO Tele Macro
• Sigma 500mm f/4.5 APO
• Sigma 500mm f/7.2 APO
• Sigma 800mm f/5.6 APO
• Sigma 28-70mm f/2.8-4 UC
• Sigma 28-105mm f/4-5.6 UC
• Sigma 28-105mm f/4-5.6 UC-II
• Sigma 70-210mm f/3.5-4.5 APO Macro
• Sigma 28-200mm f/3.8-5.6 Aspherical UC

Important Notes:

• This modchip fixes Error 01 only if there are no mechanical issues with the lens. To confirm, test your lens on a Canon film camera first.
• The modchip cannot fix cracked aperture gears, broken flex cables, or oil contamination.

Installation instructions

• Isolate the area with golden fingers ("connector used for initial programming" area in the picture). This area may already be isolated.
  
• Remove the decorative insert from your Sigma lens.
  
• Unscrew the bayonet contacts to access the flex cable.
  
• Place the Modchip on the connector as shown below, with the IC facing up.
  
• Solder all bayonet contacts to the Modchip mounting holes.
• Wrap the resulting board to fit it inside the lens housing, then screw the bayonet contacts back in place.
• Reattach the decorative insert.
• Now check the result: put lens on any digital camera, set aperture value to any number but wide open (e.g. F8) and press aperture repetier (DoF) button. Aperture on the lens must close down to desired value and get back to open as soon as you release DoF button.
• Congratulations! It works!