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FORUMS Canon Cameras, Lenses & Accessories Canon EOS Digital Cameras 
Thread started 09 Nov 2008 (Sunday) 11:16
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50D Micro-Adjustment

 
AnimalRights
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Nov 10, 2008 20:07 |  #31

The bit thats up to us is the bit that confuses me, don't laugh!
I'd rather have the Camera do it.


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gjl711
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Nov 10, 2008 20:15 |  #32

AnimalRights wrote in post #6662164 (external link)
The bit thats up to us is the bit that confuses me, don't laugh!
I'd rather have the Camera do it.

Well, the camera can not assess if it is not in focus if it has issues. The problem lies with the fact that the light path used to focus the lens is not the same as the light path used to expose the image sensor. This allow you to make adjustments based on the cameras inability to focus properly.


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Maxdave
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Nov 11, 2008 04:35 |  #33

CB357 wrote in post #6661995 (external link)
Maxdave,

My thinking exactly, as I was having a heck of a time getting the moire pattern 'crisp' in Live View and after reading PicSniper's recent post I'm leaning towards a 'real world' set up as well, so I'm thinking I'll do both :D, using both the screen target/image and then verifying using PicSniper's method.

One question though, what target/image did you use - I'm looking at using the target from blog.WillShootPhotos.c​om: Canon 50D AF Microadjustment - Instructions/Tutorial angled at 45 degrees ?

Any other 'tips' you might be able to provide would be greatfully received ;)

That's where I got the one I liked to use the best ... wspafmtarget,gif, although I did use the moire pattern target also.

The best hint I can give is to work slowly, carefully, and methodically. Keep notes ... at least I forget most everything unless I write it down.

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CB357
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Nov 11, 2008 12:29 as a reply to  @ Maxdave's post |  #34

:D thanks


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GovMule
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Dec 13, 2008 14:14 |  #35

Any suggestions for adjusting a 300mm when the minimum distance from the monitor cannot be achieved ?


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apersson850
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Dec 13, 2008 14:41 as a reply to  @ GovMule's post |  #36

In theory, cameras able to do autofocusing using the contrast on the sensor, when you use Live view, also ought to be able to make a fully automatic AF adjustment, right?


Anders

  
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aymanmb
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Dec 13, 2008 14:48 as a reply to  @ apersson850's post |  #37

so what is the final say to microadjust/test the 17-55 IS lens.

Should we I stick to the highest aperture (2.8), and longest zoom (55 mm), disable IS

OR any other recommendations


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gjl711
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Dec 13, 2008 15:17 |  #38

GovMule wrote in post #6871580 (external link)
Any suggestions for adjusting a 300mm when the minimum distance from the monitor cannot be achieved ?

I have actually had better luck using real world subjects, such as an object in the yard. Then using the grass I can clearly see where the focal plane is and adjust accordingly.


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apersson850
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Dec 13, 2008 15:25 |  #39

aymanmb wrote in post #6871712 (external link)
Should we I stick to the highest aperture (2.8 )

You can't do anything to the aperture. Focusing is always performed at max opening.


Anders

  
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therock
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Dec 13, 2008 16:54 |  #40

gjl711 wrote in post #6871840 (external link)
I have actually had better luck using real world subjects, such as an object in the yard. Then using the grass I can clearly see where the focal plane is and adjust accordingly.

I second the real world method. Weathered asphalt works well for showing the DOF.


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brantfordbandit
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Dec 13, 2008 20:03 as a reply to  @ AnimalRights's post |  #41

my 18-200 was fine at 0 but my 50mm f1.8 needed to go to +3


canonguy

  
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keener
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Jan 09, 2009 12:34 |  #42

therock wrote in post #6872338 (external link)
I second the real world method. Weathered asphalt works well for showing the DOF.

I third real world method. I tried just about all the methods that I've found on this forum and they all gave me different results that I was not happy with. In the end, I went to the back yard and used a tree branch that was pointing towards me. Focussed on a particular part of that tree branch to see if the camera/lens hit that focus point or not.


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mjmackinnon
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Feb 16, 2009 21:30 as a reply to  @ keener's post |  #43

The only thing that I can conclude is that my eyesight is not as good as everyone else on this forum.

I have tried the computer screen method, and I can't seem to figure out how to get it to work. I would have thought that I would see something different between setting it from -20 to +20. To me they all look just about the same. I guess I don't understand how it works and am just doing it all wrong.

I tried to photograph a computer screen text, and it is just about as blurry on every setting that I had.

So I tried it on a sharp 2400dpi laster print page stuck on the wall. I can't tell the difference between any of the settings. You try to do an A-B comparison, and my eyes just can't focus that well.

I will just have to give up and settle for either a random offset, or just leave it at zero and prey it's correct.

Is there any method that people in the real world can do??

Matt.


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Feb 16, 2009 21:33 |  #44

mjmackinnon wrote in post #7340762 (external link)
The only thing that I can conclude is that my eyesight is not as good as everyone else on this forum.

I have tried the computer screen method, and I can't seem to figure out how to get it to work. I would have thought that I would see something different between setting it from -20 to +20. To me they all look just about the same. I guess I don't understand how it works and am just doing it all wrong.

I tried to photograph a computer screen text, and it is just about as blurry on every setting that I had.

So I tried it on a sharp 2400dpi laster print page stuck on the wall. I can't tell the difference between any of the settings. You try to do an A-B comparison, and my eyes just can't focus that well.

I will just have to give up and settle for either a random offset, or just leave it at zero and prey it's correct.

Is there any method that people in the real world can do??

Matt.

Yes, clear off a carpeted room in your house and put a high contrast item on the floor. Shoot pretty far off from the object wide open, and see where the carpet fibers are clearest. Then microadjust that DOF so that it covers the object in question. I use carpet during the winter, or the back yard during the summer.


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goose2
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Feb 16, 2009 21:54 |  #45

I did mine with 3 artificial flowers. I placed them at different depths at 2" apart and focused on the middle one. Of coarse this was all done off a try pod. My first shots showed the front flower in focus so I new I had to adjust the camera until the center flower was in focus. I ended up with a +4 on one lens and a +9 on the other. Now they are sharp as a tac.




  
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