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 02 Apr 2008 (Wednesday) 07:50
Search threadPrev/next
sponsored links
(this ad will go away when you log in as a registered member)

Mark III AF micro adjustment question

 
RTMiller
Goldmember
Avatar
1,241 posts
Likes: 5
Joined Dec 2004
Location: Delaware, USA
     
Apr 02, 2008 07:50 |  #1

When making micro adjustments on a zoom lens, should you do your tests at a particular focal length or does it not matter? For example, when tuning a 100-400L, is there a preferred focal you should use?



Todd

www.PHOTODDGRAPHY.com (external link)
Equipment List
Everyone is beautiful if you squint.

  
  LOG IN TO REPLY
sponsored links
(this ad will go away when you log in as a registered member)
gasrocks
Cream of the Crop
Avatar
13,431 posts
Likes: 1
Joined Mar 2005
Location: Portage, Wisconsin USA
     
Apr 02, 2008 08:43 |  #2

Well, at what mm do you use it the most? I'll bet 400 for that zoom. Then, tune it for 400.


GEAR LIST
_______________

  
  LOG IN TO REPLY
JC4
Goldmember
Avatar
2,610 posts
Likes: 2
Joined Apr 2007
Location: Columbus, Ohio
     
Apr 02, 2008 09:11 as a reply to  @ gasrocks's post |  #3

I believe it does matter. And agree with gasrocks, fine-tune it at the FL you use most often.


John Caputo

  
  LOG IN TO REPLY
ben_r_
-POTN's Three legged Support-
Avatar
15,894 posts
Likes: 13
Joined Nov 2007
Location: Sacramento, CA
     
Apr 02, 2008 09:22 |  #4

Wait... How are you doing micro AF adjustments? Is that a 1D only thing?


[Gear List | Flickr (external link) | My Reviews] /|\ Tripod Leg Protection (external link) /|\
GIVE a man a fish and he'll eat for a day. TEACH a man to fish and he'll eat for a lifetime.

  
  LOG IN TO REPLY
picturecrazy
soft-hearted weenie-boy
Avatar
8,564 posts
Likes: 628
Joined Jan 2006
Location: Alberta, CANADA
     
Apr 02, 2008 09:35 |  #5

i've found it doesn't work well for zooms. It's been an exercise in frustration for me. adjusting for one focal length can throw it off for the rest of the range. And then even varying the subject distance also messes it up. I think it's kinda useless for zooms. I think it would only work if we were able to define a table of offset values depending on subject distance and focal length.


-Lloyd
The BOUDOIR - Edmonton Intimate Boudoir Photography (external link)
Night and Day Photography - Edmonton Studio Family Baby Child Maternity Wedding Photographers (external link)
Night and Day Photography - Edmonton Headshot Photographers (external link)
Facebook (external link) | Twitter (external link) |Instagram (external link) | Gear

  
  LOG IN TO REPLY
KAS
Goldmember
1,102 posts
Joined Jun 2006
Location: Niagara Region, Canada
     
Apr 02, 2008 11:46 |  #6

picturecrazy wrote in post #5244735 (external link)
i've found it doesn't work well for zooms. It's been an exercise in frustration for me. adjusting for one focal length can throw it off for the rest of the range. And then even varying the subject distance also messes it up. I think it's kinda useless for zooms. I think it would only work if we were able to define a table of offset values depending on subject distance and focal length.


agreed.

not sure how the offest values are calculated or if they're constant. But when I calibrated the 70-200 at 200mm at a distance of about 15 ft, it was off when the distance was greater (and vice versa). This makes me think it's "constant"

will have to play with it more


1Ds MkIII, 70-200 f/2.8L IS II, 16-35 f/2.8L II, EF 100mm F/2.8, EF 35 f/1.4L, EF 50 f/1.2L, EF 85 f/1.2L II)

| Niagara Weddings & Portraits - Afterglow Images (external link)
| Niagara Weddings & Portraits - Afterglow Images Blog (external link)

  
  LOG IN TO REPLY
tonylong
...winded
Avatar
54,657 posts
Gallery: 60 photos
Likes: 544
Joined Sep 2007
Location: Vancouver, WA USA
     
Apr 02, 2008 12:10 |  #7

ben_r_ wrote in post #5244653 (external link)
Wait... How are you doing micro AF adjustments? Is that a 1D only thing?

In short, yes.


Tony
Two Canon cameras (5DC, 30D), three Canon lenses (24-105, 100-400, 100mm macro)
Tony Long Photos on PBase (external link)
Wildlife project pics here (external link), Biking Photog shoots here (external link), "Suburbia" project here (external link)! Mount St. Helens, Mount Hood pics here (external link)

  
  LOG IN TO REPLY
RTMiller
THREAD ­ STARTER
Goldmember
Avatar
1,241 posts
Likes: 5
Joined Dec 2004
Location: Delaware, USA
     
Apr 02, 2008 17:25 as a reply to  @ tonylong's post |  #8

gasrocks wrote in post #5244446 (external link)
Well, at what mm do you use it the most? I'll bet 400 for that zoom. Then, tune it for 400.

JC4 wrote in post #5244596 (external link)
I believe it does matter. And agree with gasrocks, fine-tune it at the FL you use most often.

picturecrazy wrote in post #5244735 (external link)
i've found it doesn't work well for zooms. It's been an exercise in frustration for me. adjusting for one focal length can throw it off for the rest of the range. And then even varying the subject distance also messes it up. I think it's kinda useless for zooms. I think it would only work if we were able to define a table of offset values depending on subject distance and focal length.

Thanks guys. You are all correct. Not the answer I was hoping for but you are all correct. I just had a chance to adjust the 24-70L. At 70mm, +6 was right on and 24mm was backfocused. 24mm liked an adjustment of -3 but of course 70mm was then all whacked out.

I want a firmware update that allows adjustments by focal length (24mm,50mm,70mm) and the camera takes an average for the tweener focal lengths.

Or maybe I should switch to all primes. Hmmm...:rolleyes:



Todd

www.PHOTODDGRAPHY.com (external link)
Equipment List
Everyone is beautiful if you squint.

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

1,190 views & 0 likes for this thread
Mark III AF micro adjustment question
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 LaurensW
665 guests, 289 members online
Simultaneous users record so far is 15144, that happened on Nov 22, 2018

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.