Canon 40mm f/2.8 STM firmware update issues

Canon released a lens firmware update (v 1.2.0) for the EF 40mm f/2.8 STM to address widespread issues of the lens AF locking up in cases where the lens barrel is depressed. Firmware Version 1.2.0 addresses the following phenomenon. 1. … Read More

Canon EF 40mm f/2.8 STM AF motor noise

A week or two ago, I was messing around with my Zoom H1 field recorder and decided to capture some video+audio of the stepping motor (STM) in the Canon EF 40mm f/2.8 STM pancake lens. The audio is captured using … Read More

Canon EF 40mm f/2.8 STM ‘Pancake’ Lens

In early June Canon announced a pair of new EF lenses with a new Stepping Motor (STM) technology. This STM technology allows lenses to smoothly and quietly autofocus which will be beneficial for the Canon T4i (also announced at the same … Read More