90D manual focus

3 years 9 months ago #686506 by keith1955
Hello , This may seem a silly question but does the canon 90D have some sort of function where it can put manual
focus to sleep. I have 2 canon EF/STM lens and 2 EF/USM lens. and
the same thing is happening with all 4 lens. I manually focus on the subject i am going to take a photo of and then i take the photo.
When i  turn the focus ring again to do something else it does not
re-focus. I found that if i half press the shutter button  the focus ring will work as it should. I have timed how long it takes for the the focus rings on my lens to stop working. If i focus on something and count to 10 then turn the focus ring it does not alter the focus. As i say it does this on all 4 of my lens. from Mr Keith Norton


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3 years 9 months ago #686531 by 7Wishes
"I found that if i half press the shutter button  the focus ring will work as it should."
That would suggest that you are still in auto focus mode. 


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3 years 9 months ago #686549 by keith1955
Hi 7 wishes done a bit more googling on this and found others posting the same thing 

Here is a pasted reply to somebody who posted the same question on another site

Re: EF 50mm 1.8 Manual Focus not Responding





Options











‎12-14-2016

07:36 AM




















The lens is probably just fine.  Do you have "STM" version of the lens?  If so, be aware that it has an electronic focusing system.  This means that the focus ring is not mechanically connected to the focusing elements.  The lens needs power in order to focus.  If you half depress the shutter, which wakes up the viewfinder display, then you should be able to adjust focus for several seconds.


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3 years 9 months ago #686550 by keith1955
Hi 7wishes it is not stuck in auto , I found somebody else post the same question on another forum , look at the reply that I copied and pasted below.

Re: EF 50mm 1.8 Manual Focus not Responding





Options











‎12-14-2016

07:36 AM




















The lens is probably just fine.  Do you have "STM" version of the lens?  If so, be aware that it has an electronic focusing system.  This means that the focus ring is not mechanically connected to the focusing elements.  The lens needs power in order to focus.  If you half depress the shutter, which wakes up the viewfinder display, then you should be able to adjust focus for several seconds.


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3 years 9 months ago #686704 by ian_photoman403
Hi Keith1955, did you manage to figure it out? I had a similar lens issue and i found out that Canon actually has a live chat and they helped me out


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3 years 9 months ago #686707 by keith1955
Hi ian you may have got a bit confused by my reply to 7wishes , i dont know why it got posted 2 times.
The words below the large empty space and the 7.36am time is the reply that i found given to somebody else on another site.
So it would appear that my "silly question" is not so silly after all , what i described is actually supposed to happen.


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