JKPhotos
Topic Author
Posts: 773
Joined: Wed Nov 09, 2011 4:03 pm

Canon 24-70 L back focus issues

Mon Apr 10, 2017 1:45 pm

Hi,

anyone else experiencing backfocus issues with the Canon 24-70L?
In other words on some shots it is focusing on the background instead of the foreground. Of course I am able to manually select the focus point, but for example this issue also ruined a shot where I let someone else taking a shot of us. I mean I was happy enough to find someone that knew that on a DSLR you should look through the viewfinder, but if I also need to tell them about manually selecting the AF-Point it gets rather difficult.

I heard it is a known issue on the 24-105L.

I can still return it, that's why I try to make up my mind.

I am thankful for any Input.

Cheers,
Julien
 
G-CIVP
Posts: 1524
Joined: Tue Mar 20, 2001 6:38 am

Re: Canon 24-70 L back focus issues

Mon Apr 10, 2017 10:43 pm

Out of interest, is is a Mark I or Mark II lens?
 
JKPhotos
Topic Author
Posts: 773
Joined: Wed Nov 09, 2011 4:03 pm

Re: Canon 24-70 L back focus issues

Tue Apr 11, 2017 7:25 am

Mark I
 
User avatar
Miguel1982
Posts: 50
Joined: Fri Feb 18, 2011 3:53 pm

Re: Canon 24-70 L back focus issues

Tue Apr 11, 2017 9:45 am

Stupid question. Are you sure it's a potential lens issue, and not that the person taking the shot of you just focused on whatever else? If you have your camera set up so that it focuses when pressing the shutter half way, it's entirely possible that you just weren't under one of the focus points.

Surely it would be the easiest (and cheapest!) root cause :D
 
JKPhotos
Topic Author
Posts: 773
Joined: Wed Nov 09, 2011 4:03 pm

Re: Canon 24-70 L back focus issues

Tue Apr 11, 2017 11:14 am

Yes, I am sure. Because it happened to some shots I've taken as well. I now found out that it seems rather common on the 24-70, too. A bit dissapointing for me, as it is otherwise a very good objective.

Well, returning it isn't expensive. I just need to look for a new one then,
 
JakTrax
Posts: 4684
Joined: Thu Jun 30, 2005 3:30 am

Re: Canon 24-70 L back focus issues

Tue Apr 11, 2017 3:17 pm

Is it the f/4 or one of the f/2.8s?

I had the same issue with two brand new 24-105L IIs, to the point that micro-adjust couldn't solve the problem. I opted for Sigma's version instead, because they have the USB calibration dock - I didn't need the dock in the end as no issues but I can say that the Sigma is sharper than either Canon 24-105.

Take a look at Sigma's new 24-70 f/2.8 Art. If the other Art lenses are benchmarks, this one's gonna knock the Canons right into the middle of next week!
 
JKPhotos
Topic Author
Posts: 773
Joined: Wed Nov 09, 2011 4:03 pm

Re: Canon 24-70 L back focus issues

Wed Apr 12, 2017 7:16 am

Hi Karl,

it is the f/4. Yeah, I read your thread as well and it prevented me from purchasing the 24-105 (as well as other critical Reviews I found).
I will definitely return mine and will take a look at the Sigma as an alternative.I heard that is supposedly pretty heavy though-

Julirn
 
JakTrax
Posts: 4684
Joined: Thu Jun 30, 2005 3:30 am

Re: Canon 24-70 L back focus issues

Wed Apr 12, 2017 4:22 pm

Yes, the Sigma Arts are heavy, but very nicely built. For me, weight/size isn't an issue as long as the image quality's top-notch. The Sigma 24-105 loses some sharpness beyond 90mm (to the point where I'd say the Canons have a fractional edge), but below that it's noticeably better, particularly at 24mm.

The estimated cost of the new 24-70 f/2.8 Art is around £1200 (EUR1500), so it's not cheap; for that price it's going to have to be better than the Canon f/2.8s! To be honest I think it will be, otherwise Sigma will have their first Art flop!

Another reason to go Sigma Art/Sport is for the USB dock, which calibrates far more precisely than in-camera MA.

Karl

Who is online

Users browsing this forum: No registered users and 2 guests

Popular Searches On Airliners.net

Top Photos of Last:   24 Hours  •  48 Hours  •  7 Days  •  30 Days  •  180 Days  •  365 Days  •  All Time

Military Aircraft Every type from fighters to helicopters from air forces around the globe

Classic Airliners Props and jets from the good old days

Flight Decks Views from inside the cockpit

Aircraft Cabins Passenger cabin shots showing seat arrangements as well as cargo aircraft interior

Cargo Aircraft Pictures of great freighter aircraft

Government Aircraft Aircraft flying government officials

Helicopters Our large helicopter section. Both military and civil versions

Blimps / Airships Everything from the Goodyear blimp to the Zeppelin

Night Photos Beautiful shots taken while the sun is below the horizon

Accidents Accident, incident and crash related photos

Air to Air Photos taken by airborne photographers of airborne aircraft

Special Paint Schemes Aircraft painted in beautiful and original liveries

Airport Overviews Airport overviews from the air or ground

Tails and Winglets Tail and Winglet closeups with beautiful airline logos