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FORUMS Canon Cameras, Lenses & Accessories Canon EOS Digital Cameras 
Thread started 05 Feb 2013 (Tuesday) 18:54
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trx125
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Feb 05, 2013 18:54 |  #1

Ok, here's the deal. I am almost positive that my 40d is back focusing. I have tried all 3 of my lens, using my tripod, wireless remote trigger and live view for test. I use live view, 10x magnification, focus in live view manually and then half shutter press and the AF moves the focus ever so slighty. I was wondering if someone would mine trying it out for me to make sure it is the camera back focusing and not me. I can put the lens on my D60 and get very sharp images. Thanks for your time.


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Feb 05, 2013 19:37 |  #2

If you provided a more accurate location than 'other side of nowhere', you might get more responses. Just sayin'. :)




  
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Feb 05, 2013 19:44 |  #3

are you using a chart to test ?
if not print this http://www.photo.net/l​earn/focustest/scale45​.jpg (external link)




  
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trx125
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Feb 05, 2013 20:20 |  #4

adamo99 wrote in post #15576993 (external link)
If you provided a more accurate location than 'other side of nowhere', you might get more responses. Just sayin'. :)

True! I forgot I posted that!


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trx125
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Feb 05, 2013 20:24 |  #5

nybern wrote in post #15577015 (external link)
are you using a chart to test ?
if not print this http://www.photo.net/l​earn/focustest/scale45​.jpg (external link)

That one and this one. Ruler, tape measure, etc. etc. I'm running out of excuses. I'm going to let a local photographer try it with some of her lens later this week. I know I have a hand injury that makes it hard to hold steady from time to time. Thanks for your help!


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Feb 05, 2013 21:06 |  #6

so when you put you camera on a tripod and take a pic of the chart i posted are you using single point focus on the center line ? when you look at the pic on your computer does the pic look like it back focused ?




  
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trx125
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Feb 05, 2013 21:22 |  #7

nybern wrote in post #15577292 (external link)
so when you put you camera on a tripod and take a pic of the chart i posted are you using single point focus on the center line ? when you look at the pic on your computer does the pic look like it back focused ?

Yep, I use the 28-135 because it has ring usm. I put it in live mode manually focus in AF mode and take a shot. It is relatively sharp. Then I set the manual focus again then press half shutter to activate AF and take my shot it come focused better between the 1 and 2. It's just ever so slight, that is causes pictures that I know should be sharp come out soft and soft pictures even worse. I'm using mirror lockup and wireless trigger. It does the same thing with a 70-300 and 50 1.8. Maybe I am just being crazy or extremely anal about this. I used these same lens on my D60 and never had this problem, I would get an oof picture sometimes from hand shakes or subject movement. Who knows!


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Feb 05, 2013 21:25 |  #8

Also I watch the focus window after manual focusing on 10x, turn off live mode and push half shutter and the AF moves ever so slightly. Release the shutter and turn live mode back on and it is back focused. Maybe I'm just crazy!


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Feb 05, 2013 21:56 |  #9

sounds like you have a focus problem. when you go and test it with the other lenses hopefully you can test your lens on her camera.
sorry i did not help




  
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trx125
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Feb 05, 2013 22:06 |  #10

I appreciate the help.


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Feb 05, 2013 22:18 |  #11

Are you testing at a distance at least 50x the focal length? So a 50mm lens is being tested at 50x50=2,500mm or 2.5M or 8.2 feet?

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Feb 05, 2013 22:40 |  #12

28mm @ 6ft f/3.5
70mm @ 12ft f/4

1/250 external flash.

I tried to cover all my basis, maybe I missing something.


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Feb 05, 2013 22:42 |  #13

Even tried the both @ the long end, pretty much the came result.


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Feb 05, 2013 22:50 |  #14

Pay my plane ticket and I'll be right there! You can thank me later.


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trx125
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Feb 05, 2013 22:59 |  #15

LowriderS10 wrote in post #15577638 (external link)
Pay my plane ticket and I'll be right there! You can thank me later.

I wish I could. Seems Like the 40d is lost in limbo. 10-20-30D adjust screw fix focus, 50D and up have micro adjust. The 40d have neither available to the consumer. That's always my luck! :)


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