Sigma MOUNT CONVERTER MC-11 (EF-E) firmware v1.01

Sigma · Released May 13, 2016 · First seen Jul 5, 2026

v1.01 is not the latest firmware for the Sigma MOUNT CONVERTER MC-11 (EF-E): the current version is v1.43 (August 27, 2026). Go to v1.43

In short — summary by updatemystuff.com

Addresses LED lamp issues with incompatible lenses, continuous shooting, and aperture control.

  • LED lamp behavior with incompatible lenses
  • Continuous shooting mode operation
  • Aperture return to fully open

Written from Sigma's release notes, which are printed in full below.

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What's in this update

It has improved the following phenomenon that occurs when lenses that are not compatible with the MC-11 are attached and no light is emitted on the MC-11’s LED lamp.

It does not operat​e properly on continuous shooting mode.

In the case of some lenses that incorporate an OS function, when the camera’s power is turned off, it does not respond to any operation for a certain period of time.

When open aperture is not selected for shooting, the aperture does not retu​rn to fully open.

  • Improvements may not be visible with some products.
  • The phenomenon that the diaphragm closes when the camera’s power is turned off is due to the characteristic of the camera and is considered to specification.

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Other versions for this product

See the full firmware history for the MOUNT CONVERTER MC-11 (EF-E)