Timeline for What happens to a lens when you turn the focus ring during AF mode?
Current License: CC BY-SA 4.0
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| Jun 24, 2018 at 7:12 | history | edited | Michael C | CC BY-SA 4.0 |
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| Jun 4, 2013 at 13:57 | comment | added | Mike | @MichaelClark I stand corrected. | |
| May 31, 2013 at 16:02 | comment | added | Michael C | Mine works fine. I stare at it all the time. | |
| May 31, 2013 at 15:54 | comment | added | Matt Grum | The focus mechanism on the Canon 50mm f/1.4 will break, however, if you stare at it for too long:) | |
| May 31, 2013 at 15:44 | history | edited | Michael C | CC BY-SA 3.0 |
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| May 31, 2013 at 15:37 | comment | added | Michael C | @Mike Your statement is incorrect. The EF 50mm f/1.4, for example, has a Micro USM motor but is also an FTM focus lens. That's why I said as a general rule and didn't say all. It is also why I advised watching the focus ring during AF to see if it moves. | |
| May 31, 2013 at 14:24 | comment | added | Mike | @MichaelClark your comment that all Canon lenses designated USM may be manually focussed at any time is incorrect (maybe you covered this with "As a general rule" ;) But there are two types of USM - Ring type USM and Micro USM. Ring type USM lenses may be manually focussed at any time. Micro USM lenses should not be - they still have a gear train which can be damaged if you turn the focus ring while it is engaged. Unfortunately Canon won't directly tell you what lenses use what type of USM so you'll have to look it up in the specs. | |
| May 31, 2013 at 5:24 | history | edited | Michael C | CC BY-SA 3.0 |
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| May 31, 2013 at 3:49 | comment | added | Michael C | When the motor is receiving current so that it moves the lens, it is energized. When it is not receiving current, such as when the camera is turned off, it is not energized. | |
| May 31, 2013 at 2:36 | comment | added | trying_hal9000 | Could you clarify what an energized versus non-energized motor would mean? Thank you. | |
| May 31, 2013 at 2:35 | vote | accept | trying_hal9000 | ||
| May 31, 2013 at 0:38 | history | answered | Michael C | CC BY-SA 3.0 |