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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 09 Feb 2013 (Saturday) 09:54
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Regarding Sigma 30mm f/1.4

 
kinpachi
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Feb 09, 2013 09:54 |  #1

I'm not really sure if this is an issue or not, I tried doing the battery test with the Sigma 30mm f/1.4 that I just got, when I arrange the batteries next to each other it seems like I'm focusing on all of them not just the middle one, but when I put them like little bit far and on different levels the bokeh seems pretty decent. Is this a problem or it's normal?.


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kinpachi
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Feb 09, 2013 09:56 |  #2

I forgot to mention both photos were taken wide open.


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DreDaze
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Feb 09, 2013 10:06 |  #3

it looks like it may be front focusing a tiny hair... because the first ones aren't actually all in a row parallel to the camera...look at the spacing from the bottom...the one on the right seems the closest, and the sharpest...line them up more of a diagonal, like so:

-----0-----
--------0-------
-----------0---------
--------------0--------
---------------0------

make sure you choose the focus point...use one shot, on a tripod..focus on the center one

i have no clue what you'd gain from your 2nd pic...


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mrfixitx
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Feb 09, 2013 10:08 |  #4

Your depth of field runs horizontally for most lenses. So anything parallel will be in focus while items in front of or behind the focal point may be out of focus depending on the size of your DOF. Check out an online depth of field calculator to see the difference focal length, subject distance and aperture make on the DOF.


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05Xrunner
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Feb 09, 2013 10:14 |  #5

remember that 1.4 DOF is razor thin..so if they are not perfectly in line then not all will be in focus..it seems decent to me. I like mine I got a few days ago..I fine tuned it to -5 MA and its dead on now


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kinpachi
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Feb 09, 2013 10:20 |  #6

DreDaze wrote in post #15590668 (external link)
it looks like it may be front focusing a tiny hair... because the first ones aren't actually all in a row parallel to the camera...look at the spacing from the bottom...the one on the right seems the closest, and the sharpest...line them up more of a diagonal, like so:

-----0-----
--------0-------
-----------0---------
--------------0--------
---------------0------

make sure you choose the focus point...use one shot, on a tripod..focus on the center one

i have no clue what you'd gain from your 2nd pic...

Will do that and post the results. Thanks


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Talley
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Feb 09, 2013 10:24 as a reply to  @ kinpachi's post |  #7

My copy so far is a tad soft wide open unlike the first copy I had it was razor sharp wide open. stopped down to 2 is pretty good and 2.8 it's at it's best and doesn't improve past that so I'm happy. However the first copy I had which was a year ago had major AF problems... major.

This copy is spot on with AF... 0 adjustment needed on my 7D. I may send in my body with all 3 of my sigma's for cleaning/checking to be sure.


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pol024
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Feb 09, 2013 10:24 |  #8

to get that kind of framing on a AA battery you have to be inside the MFD (minimum focal distance) I am pretty sure. For AF tests canon recommends 50x the focal length, or 2.5 meters for this lens body combo.




  
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kinpachi
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Feb 09, 2013 11:01 |  #9

I think I just had a problem setting up the batteries rather than focusing, here are results of different battery arrangement.


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SMP_Homer
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Feb 09, 2013 12:31 |  #10

on that last set, you are shooting at a downward angle to the batteries... that's just another way of saying its a useless test

keep your sensor parallel to the subject if you're trying to determine if your focus is off...


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blackzarg
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Feb 10, 2013 11:44 as a reply to  @ SMP_Homer's post |  #11

Also, just to check, you are shooting with a tripod, right?


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Feb 10, 2013 12:12 as a reply to  @ blackzarg's post |  #12

I hope these are all on a tripod b/c the exposure times on all of the posted images are far to long to expect a sharp image handheld. These all also appear to be very aggressive crops of the original.


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Unregistered.Coward
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Feb 10, 2013 12:24 |  #13

Here is my tried and true method for checking lens focus

1 - Mount lens on camera
2 - Open front door
3 - Step outside
4 - Start taking pictures

After you've accumulated a hundred or so shots, after you've figured out the nuances of the lens and the implication of shooting wide open and the associated depth of field you can begin the process of measurabating over perceived focusing issues.

Gunning batteries (especially when doing it improperly) is an exercise in futility.


....the best camera is the one you have on you at the time.

  
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Regarding Sigma 30mm f/1.4
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