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Occasional Contributor
Posts: 12
Registered: ‎06-27-2017

50mm 1.8 focus problem

Whenever I focus automatically with the viewfinder, it doesnt actually focus where it says it will. For example, I tested this out with a roof and focused on the chimney and saw the red flashes indicating where the camera is focusing. It also looked perfectly in focus in the veiwfinder. When I took the shot and saw where the focus point was, it was about 10 feet closer to me than the chimney. Then I went to the lcd screen and focused the same way on the chimney and it focused perfectly. I tried this on other lenses and its only the canon 50 1.8. Its really not that expensive so I might get a new one or if you recommend a better 50mm lens. I use a canon 6d btw if that helps. Thanks.

Esteemed Contributor
Posts: 3,524
Registered: ‎06-25-2014

Re: 50mm 1.8 focus problem


JacoMedia0113 wrote:

Whenever I focus automatically with the viewfinder, it doesnt actually focus where it says it will. For example, I tested this out with a roof and focused on the chimney and saw the red flashes indicating where the camera is focusing. It also looked perfectly in focus in the veiwfinder. When I took the shot and saw where the focus point was, it was about 10 feet closer to me than the chimney. Then I went to the lcd screen and focused the same way on the chimney and it focused perfectly. I tried this on other lenses and its only the canon 50 1.8. Its really not that expensive so I might get a new one or if you recommend a better 50mm lens. I use a canon 6d btw if that helps. Thanks.


Your lens is front-focusing. Fortunately, that can be corrected by an adjustment in your camera. Dig out or download the camera's instruction manual (making sure that it's not an abbreviated version) and read up on "autofocus microadjustment".

Bob
Boston, Massachusetts USA
Occasional Contributor
Posts: 12
Registered: ‎06-27-2017

Re: 50mm 1.8 focus problem

Thanks for your feedback. Im hoping I wont have to take it in to be seen

Esteemed Contributor
Posts: 4,256
Registered: ‎11-13-2012

Re: 50mm 1.8 focus problem

What camera model?

John Hoffman
Conway, NH

1D X, Rebel T5i, Many lenses, Pixma PRO-100, MX472
Occasional Contributor
Posts: 12
Registered: ‎06-27-2017

Re: 50mm 1.8 focus problem

This may sound weird but Im actually in Boston right now visiting. Im hoping to go to the leica store. Do you have any recommendation as to where to go with family and for photography. Id like to take unique photos not just the ones you see on google images. Im thinking acorn street or the outdoor library but idk. Thanks

Occasional Contributor
Posts: 12
Registered: ‎06-27-2017

Re: 50mm 1.8 focus problem

A 6d

Esteemed Contributor
Posts: 4,256
Registered: ‎11-13-2012

Re: 50mm 1.8 focus problem

Then you can AFMA. If it was a Rebel you couldn't.

 

http://www.learn.usa.canon.com/resources/articles/2011/af_microadjustment_article.shtml

John Hoffman
Conway, NH

1D X, Rebel T5i, Many lenses, Pixma PRO-100, MX472
Respected Contributor
Posts: 1,769
Registered: ‎02-26-2015

Re: 50mm 1.8 focus problem


jrhoffman75 wrote:

Then you can AFMA. If it was a Rebel you couldn't.

 

http://www.learn.usa.canon.com/resources/articles/2011/af_microadjustment_article.shtml


If it is an older EF 50mm f/1.8 and not an STM version, even AFMA may not help as those older lenses had inconsistant focus.

 

If you don't have the STM version spend the $90 and get one.

EF 50mm f/1.8 STM Refurbished

Occasional Contributor
Posts: 12
Registered: ‎06-27-2017

Re: 50mm 1.8 focus problem

Yes its the stm. I would never put a bad set of glass in front of a 6d lol

Honored Contributor
Posts: 7,932
Registered: ‎12-07-2012

Re: 50mm 1.8 focus problem

AFMA is a correction of the marginal errors found in an auto focus system so that it functions closer to perfect.  I am not as sure that 10 feet qualifies!  Having never owned a 6D I can not say exactly how much AFMA it has but the lenses I ever corrected were less than 10 inches, not 10 feet.

A lot of Canon stuff. Along with, a lot of other stuff.
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