Timeline for What is USM, and what are its pros and cons?
Current License: CC BY-SA 3.0
12 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Feb 19, 2018 at 10:58 | comment | added | Mike Sowsun | No, that’s incorrect. The EF 50mm 1.4 USM is the ONLY Micro USM lens to have FTM. All other Micro USM lenses have rotating front elements, no focus distance scale, a Focus ring that spins during AF, and no FTM. In my opinion they should all be avoided. | |
| Jul 15, 2014 at 0:03 | history | edited | Michael C | CC BY-SA 3.0 |
added 38 characters in body
|
| Jul 15, 2014 at 0:02 | comment | added | Michael C | OK, so there is at least one Micro USM lens that does not have FTM focus, but the majority of Micro USM lenses do and that should probably be reflected in your answer. | |
| Jul 15, 2014 at 0:00 | comment | added | Michael C | The EF 75-300mm f/4-5.6 USM III is not a lens, it is a paperweight pretending to be a lens. :-) | |
| Jul 14, 2014 at 16:23 | comment | added | crunch | @MichaelClark: EF 75-300mm USM (non-IS) series has micro-USM but not full-time manual focus. | |
| May 7, 2014 at 23:19 | comment | added | Michael C | "...The preferred type is "Ring Type" which always allows for manual focus without turning off auto-focus." Can you provide an example of a Canon lens that includes a micro-USM motor that does not have full time manual focus? I've not come across one that doesn't. The EF 50mm f/1.4 has a micro-USM motor and certainly has full time manual focus. | |
| Dec 20, 2011 at 3:15 | vote | accept | dpollitt | ||
| Nov 10, 2011 at 10:26 | comment | added | jwenting | another downside: weight. Another name for USM Nikon uses is AF-S (Auto Focus - Silent wave). | |
| Nov 8, 2011 at 15:54 | history | edited | chills42 | CC BY-SA 3.0 |
added 453 characters in body
|
| Nov 8, 2011 at 14:35 | history | edited | chills42 | CC BY-SA 3.0 |
added 22 characters in body
|
| Nov 4, 2011 at 15:23 | history | edited | chills42 | CC BY-SA 3.0 |
added 109 characters in body
|
| Nov 4, 2011 at 15:15 | history | answered | chills42 | CC BY-SA 3.0 |