MC-11 Mount Converter
The Mount Converter MC-11 allows you to use your Sigma SA mount and Sigma EOS mount interchangeable lenses with the Sony E-mount camera body. Until now, the market has seen the introduction of many methods for using lenses from one camera system with a body from a different system. In the digital age, however, camera systems have become much more complex, and it is challenging to create a mount converter that aligns both the mechanics and software of the lens and body. Sigma created a converter that matches lenses for current DSLRs to bodies for mirrorless interchangeable-lens camera systems is even more challenging. Now the market demands a converter that goes beyond simply aligning the flange back distance to retaining full functionality.
Note: Only available in the US
Our Review
Sigma MC-11 Mount Converter — Use Your Sigma or Canon Glass on Sony Mirrorless Without Losing Autofocus
The gist: A smart adapter for travelers who already own Sigma or Canon EF lenses and want to switch to a Sony mirrorless body without replacing their entire glass collection.
- Full autofocus preserved: Supports all Sony AF modes including Eye-AF — unlike dumb adapters that reduce lenses to manual-focus operation only.
- Dual mount compatibility: Works with Sigma SA-mount and Sigma EOS (Canon EF-mount) lenses, covering a wide range of existing glass investments.
- Firmware updatable: Built-in mini USB port lets you update the adapter with Sigma Optimization Pro as new camera and lens firmware ships, extending compatibility over time.
- Auto-exposure maintained: Keeps aperture control and metering fully electronic, so you shoot as you normally would — no exposure guesswork from stopped-down previews.
The Phoblographer reviewed the MC-11 as a standout performer, emphasizing how well it maintained autofocus performance — especially compared to third-party adapters that compromise AF speed and accuracy.
Best for: Photographers switching from Sigma SA or Canon EF systems to Sony E-mount who want to carry their existing lenses without sacrificing AF. Skip it if: you use Nikon F, Canon RF, or any non-Sigma, non-Canon-EF glass — compatibility is limited to those two mount types. Runs ~$186 — check the current price before buying.
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