40mm STM Manual Focus & DoF Preview

Started Aug 7, 2012 | Discussions thread
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40mm STM Manual Focus & DoF Preview
Aug 7, 2012

Hey there,

A quick observation, and interesting point of discussion.

During a landscape shooting today, I noticed that it is NOT possible to manually focus the new Canon EF40mm f/2.8 STM lens when the depth of field preview button is held down.

Whether or not this is just because it's an electronically driven Manual Focus, and not mechanical, or if it's a property of the new STM AF system I am not sure. I tested it on both a 1DX, and 1D IV with the same results.

Does anyone have any thoughts on this?


Canon EOS-1D
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