06-29-2017 12:04 PM - edited 06-29-2017 12:05 PM
Hi everyone,
I have a canon 60D + 50 mm 1.4 canon lens.
I bought two of them ; but the focus of the lens ( Auto&manual) was not working because of barrel ring deformation.
So, I purchased the part from internet, manual focus works now perfectly. But, the autofocus does not give perfect results. If I zoom while autofocusing, the camera skip the perfect focus and stop focus on a blurry image.
So, what do you think ? could the problem be from the ring or the motor of the lens? and of course, I hope it's not a camera problem...
Thank you very much !
06-29-2017 01:16 PM
Don't know what you're talking about when you say "when I zoom". It isn't a zoom lens. Sounds like you are the problem by using the focus ring when also using the AF.
06-29-2017 03:04 PM
I'm talking about digital zoom, two buttons on top right of the camera, the zoom is just to check focusing !!!
No, I use manual focus when the button on the lens is on "MF"
06-29-2017 02:18 PM
I think the Pottery Barn rule applies here.
SInce you took the lens apart and put it back together, we have no idea what might be wrong.
SInce you have a 60D, you can use AFMA to adjust things between the camera and the lens. In fact, if you had AFMA set before, that might be the issue now.
06-29-2017 02:58 PM
60D has no afma feature.
06-29-2017 03:38 PM
Oops, I thought all cameras above rebels had it.
06-29-2017 07:38 PM
50D, 70D and 80D have AFMA but not 60D
BTW, if the image looks blurry when magnified, it could be motion blur or lens not accurately calibrated.
06-30-2017 04:47 AM - edited 06-30-2017 04:48 AM
I don't think it's motion blur, because the autofocus result is the same even with static object.
How can I calibrate correctly my lens ?
I will add a video showing the operation of the autofocus, I think that can help explaining the situation for you.
06-30-2017 07:51 AM - edited 06-30-2017 08:10 AM
No, you cannot calibrate the lens up to factory standard by yourself. Even the slightest adjustment of the screws on the helicoid will change the tilting angle of the glass elements of the lens. Improper installation will as well cause trouble.Check if you have over-tightened some screws.
I am a big fan of DIY repair. I found it not so hard to replace parts in cameras.But for lenses, it is a lot more complicated especially when you have to go beyond touching the USM and helicoid etc.
REPAIRING LENS IS NOT JUST ABOUT REMOVING SCREWS AND REPLACING PARTS.
Send it to Canon or use it as manual focus lens and focus in LV.
Good luck to you.
07-02-2017 11:16 AM
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