Approve the Cookies
This website uses cookies to improve your user experience. By using this site, you agree to our use of cookies and our Privacy Policy.
OK
Index  •   • New posts  •   • RTAT  •   • 'Best of'  •   • Gallery  •   • Gear  •   • Reviews
Guest
New posts  •   • RTAT  •   • 'Best of'  •   • Gallery  •   • Gear  •   • Reviews
Register to forums    Log in

 
FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 09 Jun 2010 (Wednesday) 16:11
Search threadPrev/next
sponsored links
(this ad will go away when you log in as a registered member)

How to Calibrate a 70-200 F4

 
corndog ­ cabernet
Senior Member
Avatar
362 posts
Gallery: 72 photos
Likes: 725
Joined May 2010
Location: State of chaos
     
Jun 09, 2010 16:11 |  #1

First, I don't want to start up another one those "pilot error" threads. I don't need people telling me I'm wrong here, I know what I'm doing and my 70-200 F4 clearly and consistently back focuses. I also believe that IF I can do it myself, I'll do a better job than Canon as I give a %$@* and I have my body to use for the process.

My question... Does anyone have any PDFs, photos, links, etc. as to how to calibrate the lens yourself?
I'm strong, I'm brave, I can handle it. :p

I've already calibrated my XT body for my EF400 f5.6 (front focused) and it's working great but this has somewhat exacerbated the focus issue with the 70-200 (back focusing). Until I get a 7D, down the road, I'd like to get all my lenses working in harmony with my XT.

Thanks in advance.




  
  LOG IN TO REPLY
sponsored links
(this ad will go away when you log in as a registered member)
Dereksalem
Member
119 posts
Joined May 2010
     
Jun 09, 2010 17:36 |  #2

not sure how to do it, but I'm actually pretty sure that when you send a lens to canon for calibration they also request you send the body along with it (they calibrate them together). I'm almost 100% positive on this.




  
  LOG IN TO REPLY
corndog ­ cabernet
THREAD ­ STARTER
Senior Member
Avatar
362 posts
Gallery: 72 photos
Likes: 725
Joined May 2010
Location: State of chaos
     
Jun 09, 2010 17:49 |  #3

Dereksalem wrote in post #10333669 (external link)
not sure how to do it, but I'm actually pretty sure that when you send a lens to canon for calibration they also request you send the body along with it (they calibrate them together). I'm almost 100% positive on this.

Makes sense but I still want to do it myself, if I can. What's the old adage? If you want something done right, yada yada....

See, I'm kinda fussy 'bout this stuff and I'm thinking what if it comes back improved but not great? Do I send it back for round two? Understand it's all on my dime as well for the lens is 6 years old.




  
  LOG IN TO REPLY
SkipD
Cream of the Crop
Avatar
20,473 posts
Likes: 152
Joined Dec 2002
Location: Southeastern WI, USA
     
Jun 09, 2010 17:59 |  #4

corndog cabernet wrote in post #10333728 (external link)
How to Calibrate a 70-200 F4

The only way is to send your lens (and possibly the body) to one of Canon's service centers. They use proprietary software - and probably optical alignment hardware - to do the job.

I'm fairly certain that the process involves writing a table of data to the lens' electronics as a result of the procedure.


Skip Douglas
A few cameras and over 50 years behind them .....
..... but still learning all the time.

  
  LOG IN TO REPLY
corndog ­ cabernet
THREAD ­ STARTER
Senior Member
Avatar
362 posts
Gallery: 72 photos
Likes: 725
Joined May 2010
Location: State of chaos
     
Jun 09, 2010 19:50 as a reply to  @ SkipD's post |  #5

I had read something like this before and you sound pretty convincing Skip. Still, with all the attention this gets and all the geeks out there it wouldn't at all surprise me if there were a hack.

Since I'm unlikely to send an otherwise good working lens to Canon for a fix that may or may not be to my satisfaction, I'll sit tight and maybe a better answer will come along.
BTW one of the reasons I'm a little cynical about this is that I spent 70 minutes on two different occasions with two different people in tech support at Canon recently and both acted like they'd never heard of anything like this before. In retrospect, I wonder if they would have been as ignorant had I said I had a 50D or 7D? Two cameras that let folks like me calibrate the body to their lenses ;)




  
  LOG IN TO REPLY
rx7speed
Goldmember
1,204 posts
Joined Jun 2008
     
Jun 09, 2010 23:48 |  #6

talking to the tech support is a different group then the tech repair people. most the threads I see regarding having the actual repair people fix the problem is usually good results.

I'm sure a hack would be hard to come by as these lenses have been out since the late 80's by now and yet still in 2010 it hasn't happened yet. it's quit a bit different then just a little screw adjustment in the XT mirror box area.

even with the 7d and the microadjust there is still no promise that your 70-200 will focus correctly at that point as you can microadjust it to work at lets say 70mm but now at 200mm it's out of wack.

so you might have some luck with this sure but honestly I think your best bet as much as you would prefer not is to get the lens over to canon.


digital: 7d 70-200L 2.8 IS MKII, 17-55 2.8 IS

  
  LOG IN TO REPLY
sponsored links
(this ad will go away when you log in as a registered member)

2,477 views & 0 likes for this thread
How to Calibrate a 70-200 F4
FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
AAA
x 1600
y 1600

Jump to forum...   •  Rules   •  Index   •  New posts   •  RTAT   •  'Best of'   •  Gallery   •  Gear   •  Reviews   •  Member list   •  Polls   •  Image rules   •  Search   •  Password reset

Not a member yet?
Register to forums
Registered members may log in to forums and access all the features: full search, image upload, follow forums, own gear list and ratings, likes, more forums, private messaging, thread follow, notifications, own gallery, all settings, view hosted photos, own reviews, see more and do more... and all is free. Don't be a stranger - register now and start posting!


COOKIES DISCLAIMER: This website uses cookies to improve your user experience. By using this site, you agree to our use of cookies and to our privacy policy.
Privacy policy and cookie usage info.


POWERED BY AMASS forum software 2.1forum software
version 2.1 /
code and design
by Pekka Saarinen ©
for photography-on-the.net

Latest registered member is dlpso
818 guests, 348 members online
Simultaneous users record so far is 6430, that happened on Dec 03, 2017

Photography-on-the.net Digital Photography Forums is the website for photographers and all who love great photos, camera and post processing techniques, gear talk, discussion and sharing. Professionals, hobbyists, newbies and those who don't even own a camera -- all are welcome regardless of skill, favourite brand, gear, gender or age. Registering and usage is free.