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FORUMS Canon Cameras, Lenses & Accessories Canon EOS Digital Cameras 
Thread started 12 Sep 2011 (Monday) 02:15
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Double Trouble -lens or camera

 
Cassiedup
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Sep 12, 2011 02:15 |  #1

Hi to everybody from a newbie on the forum, and now for my problem...
I recently bought a used 5D mk11 as well as a Sigma 180 macro lens (from different owners ) planning to expand into macro photography, now for my problem.
1. After checking the focus aquisition at near minimum focus distance by using the back button or in live view I found that I had to micro-adjust to +20 to get near perfect results, so my first reaction was to fault the lens.
2. However using the same lens on my 1D mk iv no micro-adjustment was needed, so now the 5D is at fault.
3. HOWEVER switching to my 300 f2.8 lens I get perfect focus on both the 1D and 5D.
Do I just accept the adjustment on the 5D/lens combo or what else can I try ?????


5D MK IV 80D 17-40L, 70-300L, 300 F2.8L, 500 F4L, 100 F2.8 L Macro Sigma 150-600 S

  
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Bendel
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Sep 12, 2011 02:29 |  #2

If it focuses properly after adjustment, what difference does it make? Sounds like everything worked out and you can go take pictures now.


Brandon
Canon 5D, 24-105 F4L, 70-200 F4L, 85 F1.8, 430EX II

  
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*Jayrou
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Sep 12, 2011 02:31 |  #3

Welcome to POTN

As its a macro lens, how often would you use AF at MFD?

Live view, manual focus and 10x magnification is the way I go with macro.

You're going to have a razor thin DOF to work to when calibrating a macro lens at near minimum focus distance and I've never tried it and I don't know your test set up, but it sounds like even the slightest error in your test will throw it way off.

Personally as its a macro, I'd just leave it, that's only because I manually focus all the time when using one.


James
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Cassiedup
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Sep 12, 2011 04:28 |  #4

Hi guys, thanks for your replies, I suppose you are both correct as I will be using MF most of the the time in any case, I just found it strange that there could be such a difference between the camera/lens combinations .


5D MK IV 80D 17-40L, 70-300L, 300 F2.8L, 500 F4L, 100 F2.8 L Macro Sigma 150-600 S

  
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SMP_Homer
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Sep 12, 2011 06:15 |  #5

how is the focus on the Sigma lens when using it in the 'normal' range (say, 6-10 feet)?


EOS R / 1D X / 1D IV (and the wife has a T4i)
Sig35A, Sig50A, Sig85A, Sig14-24A, Sig24-105A, Sig70-200S, Sig150-600C
100-400L, 100L, 100/2, 300 2.8L, 1.4x II / 2x II
600EX-II X3, 430EX-III X3

  
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yogestee
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Sep 12, 2011 09:06 as a reply to  @ SMP_Homer's post |  #6

Welcome to POTN :D

Often it's not the lens nor the camera alone but the combination of the two.


Jurgen
50D~700D~EOS M~G11~S95~GoPro Hero4 Silver
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The Title Fairy,, off with her head!!

  
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Cassiedup
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Sep 12, 2011 14:55 |  #7

SMP_Homer wrote in post #13088962 (external link)
how is the focus on the Sigma lens when using it in the 'normal' range (say, 6-10 feet)?

Hi Homer, in the 6-10 feet range without any adjustment the images are very soft except when stopped down to f16 - f22 while I can match the sharpness of said images in the f5.6 - f8 range when adjusting to +20, so I think both the camera and lens is leaning towards front focus and it is the compound effect of the combo causing the softness, so thanks heavens for the micro-adjustment feature.


5D MK IV 80D 17-40L, 70-300L, 300 F2.8L, 500 F4L, 100 F2.8 L Macro Sigma 150-600 S

  
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Double Trouble -lens or camera
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