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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 13 Aug 2012 (Monday) 10:54
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50L and 5d3 outer focusing issues..

 
BryantFC
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Aug 13, 2012 10:54 |  #1

Am I going crazy or just being OCD? I'm using a Canon 5D mark III and a 50L f1.2. After getting it calibrated correctly in correct conditions
using Reikan Focal, i'm getting inconsistant results from using outer focus points. Mine required a +5MA adjustment which imo, isn't too extreme.
From f1.2 and on up using the center cluster area, subject area i'm focusing on is always sharp and on point. This is using Single AF one shot and
Single Spot AF one shot.

But the biggest issue is when I start using outer focusing points. Both single point and spot AF, AF areas are slightly heavily softer than center point.
It slightly improves once i start shooting at f2.8 and up. I also own a 35L which required +8MA and an 85mm f1.8 that requires -4 MA. Every single focus point
is just as sharp as center point with these two lenses. I don't understand why it's a constant issue with the 50L. My question is that is there something wrong with my lens
or is it just a particular characteristic of this lens?


Here's a small test I did using a tripod and available morning light.

url=http://www.flickr.​com/photos/bryantpheth​manh/7739547838/]

IMAGE: http://farm9.staticflickr.com/8428/7739547838_4eae69a64d_c.jpg
5+MA center point (external link) by BryantFC (external link), on Flickr

IMAGE: http://farm8.staticflickr.com/7129/7739543914_5a561de525_c.jpg
IMAGE LINK: http://www.flickr.com …yantphethmanh/7​739543914/  (external link)
5+MA outer left point (external link) by BryantFC (external link), on Flickr
slightly softer and i'm focusing on the "hydro" this is the furthest outer left point at +5 on my 5d3.

now this is the weird part. if i dial in a +15MA and shoot the same shot, it's sharper in the same area.

IMAGE: http://farm9.staticflickr.com/8431/7739535984_e5391a3515_c.jpg
IMAGE LINK: http://www.flickr.com …yantphethmanh/7​739535984/  (external link)
15+MA outer left point (external link) by BryantFC (external link), on Flickr

this also applies to the furtest outer right point on the 5d3. +5 for the first and then +15 on the second.

IMAGE: http://farm9.staticflickr.com/8282/7739540048_b713846aa5_c.jpg
IMAGE LINK: http://www.flickr.com …yantphethmanh/7​739540048/  (external link)
5+MA outer right point (external link) by BryantFC (external link), on Flickr

IMAGE: http://farm8.staticflickr.com/7134/7739531970_ea61240d0c_c.jpg
IMAGE LINK: http://www.flickr.com …yantphethmanh/7​739531970/  (external link)
15+MA outer right point (external link) by BryantFC (external link), on Flickr


I also found that if i switched to just using 15 AF points, it's slightly better. For instance, here's a shot I did yesterday using one of the outer focus points with the 15 AF
points, and although it's not as sharp as usual, something doesn't look right to me..

This is f1.2 focus on eye and outer focus point using 15 AF point.
IMAGE NOT FOUND
IMAGE IS A REDIRECT OR MISSING!
HTTP response: NOT FOUND | MIME changed to 'image/gif' | Redirected to error image by FLICKR

50L f1.2 (external link) by BryantFC (external link), on Flickr

Is the issue my own issue due to user error? Am I expecting too much out of extreme shallow depth of field at wide apertures? I can't say I can blame my 5D3 due to the fact that
I don't have this problem on my other two lenses..

I'd like some strong advice on this since this is my go to portrait lens. It is a pain because I bought the 5d3 for the AF system and to get rid of focus recompose.
If it is a lens issue and it's out of warranty, any idea how much Canon will charge to calibrate it to my 5d3?
Sounds like a good reason for me to sign up for CPS Silver soon..

Mamiya M645 1000S, Mamiya RZ67, Polaroid SX-70 Alpha, Polaroid 250 Auto Land Camera, Leica M3, Canon Elan II
www.bryantphethmanh.co​m (external link)
http://www.flickr.com/​photos/bryantphethmanh​/ (external link)

  
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kylyo
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Aug 13, 2012 11:11 |  #2

I had similar results and ended up selling my 50L, which is a shame cause I really like the focal length. My 35L was whacked at first, but after MA it is very consistent with every point. I MA'ed my 50L and just got inconsistent results.

I don't know what to think cause I see others with the same problem, but then some people report that combo being exceptional. So, I don't know...wish mine worked, I miss that lens.


5d III | Canon 16-35L II | Canon 35L | Canon 70-200 II |

  
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BryantFC
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Aug 13, 2012 11:18 |  #3

kylyo wrote in post #14852377 (external link)
I had similar results and ended up selling my 50L, which is a shame cause I really like the focal length. My 35L was whacked at first, but after MA it is very consistent with every point. I MA'ed my 50L and just got inconsistent results.

I don't know what to think cause I see others with the same problem, but then some people report that combo being exceptional. So, I don't know...wish mine worked, I miss that lens.

Thanks for the reply. I knew it wasn't just me having the same issues. It seems like a certain amount of people disagree, but i've came across the same issues i'm having with other users as well. Really don't want to sell this lens. And it's pointless to have this body just to use center AF only. Really depressing.


Mamiya M645 1000S, Mamiya RZ67, Polaroid SX-70 Alpha, Polaroid 250 Auto Land Camera, Leica M3, Canon Elan II
www.bryantphethmanh.co​m (external link)
http://www.flickr.com/​photos/bryantphethmanh​/ (external link)

  
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kylyo
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Aug 13, 2012 12:37 as a reply to  @ BryantFC's post |  #4

I kind of wish I would have sent the body and lens in for adjustment to see if it came back better. Might be worth a shot.


5d III | Canon 16-35L II | Canon 35L | Canon 70-200 II |

  
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cdang
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Feb 22, 2013 22:07 |  #5

I've had this problem with the 50L. A bit less with my 85L.. I'm not happy having to always use the 5 centre points for critical shots. Hours and hours on FoCal with no success. I am about to send it all to canon for calibration. Will let you know when I get them all back.




  
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Albert ­ Nam
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Feb 22, 2013 22:13 |  #6

Yes!! I have this problem, and I almost feel like I'm back with the 5DII because I'm focus/recomposing with the center group of points. FoCal gives wildly different values for outer corner and center points.


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cdang
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Feb 22, 2013 23:54 |  #7

Albert Nam wrote in post #15642268 (external link)
Yes!! I have this problem, and I almost feel like I'm back with the 5DII because I'm focus/recomposing with the center group of points. FoCal gives wildly different values for outer corner and center points.

Yes I feel your pain !!

Is it with all your lenses or just the 50L ? It certainly does feel like I'm back with the 5D2. Have you found a work a round ?




  
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BryantFC
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Feb 23, 2013 02:49 |  #8

Good luck, I sent mine in to CPS and they didn't do jack. Came back with the same issues and $200 out of my pocket. I gave up on that lens.


Mamiya M645 1000S, Mamiya RZ67, Polaroid SX-70 Alpha, Polaroid 250 Auto Land Camera, Leica M3, Canon Elan II
www.bryantphethmanh.co​m (external link)
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BIllionfps
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Feb 23, 2013 08:23 |  #9

So the best option would be to use centre AF points and then crop in order to get the framing we want.


Canon 5D3 | 24L II | 50L | 85 1.8 | 135L

  
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GuitarDTO
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Feb 23, 2013 09:10 |  #10

This happens with my 50/1.4 as well. The outer autofocus points on the 5D3 I don't believe are as accurate as the center when you are at such a large aperture, and when you reduce the number to 15 things probably improve because I believe the camera is showing 15 of the more accurate autofocus points. Either way, when I'm going for thin DOF I usually just use the center point and recompose. If the shot I am taking is even more critical that I nail the focus, I'll just manual focus using live view.


Gear: 5D3, 135L, Sigma 35, 50 1.8 STM, 16-35 F/4L IS, 85/1.8, Fujifilm X100T
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MatthewK
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Feb 23, 2013 09:44 |  #11

I noticed this phenomenon b/w the 5D3 + 50L when shooting more distant targets with the outer points. Sent it in to Canon, and it still does it, but it really isn't a regular occurrence.


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BryantFC
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Feb 23, 2013 12:54 |  #12

GuitarDTO wrote in post #15643164 (external link)
This happens with my 50/1.4 as well. The outer autofocus points on the 5D3 I don't believe are as accurate as the center when you are at such a large aperture, and when you reduce the number to 15 things probably improve because I believe the camera is showing 15 of the more accurate autofocus points. Either way, when I'm going for thin DOF I usually just use the center point and recompose. If the shot I am taking is even more critical that I nail the focus, I'll just manual focus using live view.

No offense, but I call that B/S. How am I able to shoot f1.2 with an 85LII on an outer focus point cross type and that's more sharper and in focus than with the 50L? Regardless of the fact that the 85LII is a sharper lens, even the 35L I owned performed the same way with the 85LII. Same goes with the Sigma 85 and 35.

There's something up with that lens when paired with the mark III. Focus recomposing imo is pointless considering what's the reason to buy the 5d3? To have more AF points and not have to deal with focus recomposing. If that wasn't the case, then why bother moving from the 5D2 or any other camera.


I remember reading a while back the the earlier batches of the 7D were the same way. They had focus issues with the AF points. Crazy part I still don't understand is when I paired the 50L on an old Canon EOS 3 film SLR with well over 30 AF points, it PERFORMED better than on two 5d3's.


Mamiya M645 1000S, Mamiya RZ67, Polaroid SX-70 Alpha, Polaroid 250 Auto Land Camera, Leica M3, Canon Elan II
www.bryantphethmanh.co​m (external link)
http://www.flickr.com/​photos/bryantphethmanh​/ (external link)

  
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50L and 5d3 outer focusing issues..
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