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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 03 Feb 2008 (Sunday) 19:18
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Is this how a focus test should look?

 
mcneguy
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Feb 03, 2008 19:18 |  #1

With the exception of it being no where near straight, of course.


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Potisdad
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Feb 03, 2008 19:52 |  #2

Front focussing a little.


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T.Hogan
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Feb 03, 2008 20:04 |  #3

Do you have the camera on a tripod at a 45 degree angle?


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mcneguy
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Feb 03, 2008 21:05 as a reply to  @ T.Hogan's post |  #4

The camera was on a tripod, I used a remote to take the picture. I think the 45 degree angle was close however I was using a cheap crappy tripod that I used once for a video camera and there are not markings to verify the angle.




  
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gryphonslair99
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Feb 03, 2008 21:38 |  #5

For an accurate test it needs to be exactly at 45 degrees and the focus chart needs to be straight. Your hardware store will have a small inexpensive device that you can set on the top of the tripod head before mounting the camera and tell exactly the angle it is at.
http://www.acehardware​.com …arch&searchId=2​2899502503 (external link)


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dekalbSTEEL
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Feb 03, 2008 21:49 |  #6

Please don't ever put a 1d series camera on a cheap crappy tripod:cry:


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xarqi
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Feb 03, 2008 22:00 |  #7

gryphonslair99 wrote in post #4845549 (external link)
For an accurate test it needs to be exactly at 45 degrees

True, but only as far as the calibration in mm/inches is concerned. If all you are interested in is whether the lens is focusing correctly, or front-, or back-focusing, any angle except 0 or 90° will work.




  
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mcneguy
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Feb 03, 2008 22:35 |  #8

dekalbSTEEL wrote in post #4845622 (external link)
Please don't ever put a 1d series camera on a cheap crappy tripod:cry:



Yes, I agree but it was there. I would buy a nice one but I cannot imagine what I would ever use it for other than this.




  
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ok20
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Feb 04, 2008 21:52 |  #9

Where can I get a printable version of that focus chart?


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danpass
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Feb 04, 2008 21:55 |  #10

ok20 wrote in post #4852861 (external link)
Where can I get a printable version of that focus chart?

I'll second this request.

googling:

focus checker pdf

didn't work when I tried it.

.


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ok20
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Feb 04, 2008 21:57 |  #11

Here, apparently many people use this PDF file and printable page (external link).

I found it on an archived thread.


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wizard13
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Feb 04, 2008 22:02 |  #12

Here is the focus chart.


edit: guess I was a shade late. My file is just the chart, not the entire manual.


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danpass
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Feb 04, 2008 22:35 |  #13

ok20 wrote in post #4852884 (external link)
.......
I found it on an archived thread.

aaahhhhhh ... the 'ol 'use the search function' statement .... but in stealth mode.

:D

.


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JackProton
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Feb 05, 2008 00:21 |  #14

mcneguy wrote in post #4845381 (external link)
The camera was on a tripod, I used a remote to take the picture. I think the 45 degree angle was close however I was using a cheap crappy tripod that I used once for a video camera and there are not markings to verify the angle.

To get 45 degrees, you just need to move the center of the chart away from the base of the tripod the same distance the lens is from the ground:

LENS
| X inches
|
|
|
-------------- CHART CENTER
X inches

Bur it looks like your problem is really that the camera wasn't level to begin with.

Anyways, taking the angle into consideration, the focus chart results are probably OK.




  
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Is this how a focus test should look?
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