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Thread started 11 Feb 2014 (Tuesday) 12:02
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Tamron 28-75 2.8 XR Di focus problems?

 
mr2step
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Feb 11, 2014 12:02 |  #1

Hey everyone. I have owned a previously owned Tamron 28-75 2.8 for the last couple of years. What I've begun to notice is that when I take image with with camera on the 2.8 side, the images are often soft/out of focus. This seems to be a fairly new issue I've noticed. I have read that Tamron's have QA issues during production. Anyone else run into this problem? I don't know how old the lens is as I am the second owner. I am not sure whether to sell it and buy a new one or send it in to Tamron for inspection. Of course, I am thinking it may cost as much to fix as it is to buy a new one. Does autofocus rely on body or a lens' inherit quality? I have been meaning to upgrade to a 70d from a T1i and was wondering if that may alleviate the issue. What is everyone's thoughts?


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burb1972
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Feb 11, 2014 15:48 |  #2

i stack cereal boxes, on edge so you see the nutritional information, and have them like in a step kinda pattern, focus on the center one, use tripod and timer, see if you are front focusing, could also just print a focus test sheet, but im kinda partial to cereal boxes. i also tested by putting boxes in corners of my fireplace, found my tamron focus blows in upper left corner. Plus shows color, saturation, contrast.


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gasrocks
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Feb 11, 2014 16:54 |  #3

How mny AF points do you have active?


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mr2step
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Feb 11, 2014 18:50 |  #4

The T1i only has 9 focal points.


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yogestee
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Feb 11, 2014 23:39 as a reply to  @ mr2step's post |  #5

You have to determine, are the images opitally soft or not sharp due to misfocus.


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phreeky
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Feb 12, 2014 06:56 |  #6

mr2step wrote in post #16682185 (external link)
The T1i only has 9 focal points.

But how many are you using? All active or just the centre one etc?




  
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mr2step
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Feb 12, 2014 11:58 as a reply to  @ phreeky's post |  #7

In this particular case of my issue, I use only one AF point at a time since i am shooting down at f2.8. In my opinion the images are blurry. I guess soft was misused wording. The faces are blurry. The more I think about it the more I am beginning to think it was user error. At least that is my optimistic thinking. I was shooting on "one shot" AF and doing concerts I probably should have been using AF-servo to constantly keep focus. Even though I had a high enough shutter speed for the pics 1/180-1/350 for hand holding more or less and the subject was fairly stationary (yes I know about the 1/focal length hand hold rule of thumb) at ISO 3200 the singers could have been moving just enough to blur the pics using "one shot" AF instead of Auto Serve.


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paddler4
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Feb 12, 2014 15:49 |  #8

I had one for 4 or 5 years and never had a problem. While the best testing of focusing is at a longer distance, you can get a pretty good idea using a focus chart like this one: http://regex.info/blog​/photo-tech/focus-chart (external link). Do center point only, open to 2.8, and follow the instructions about positioning the camera.


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mr2step
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Feb 13, 2014 09:24 as a reply to  @ paddler4's post |  #9

Paddler_4- Thanks so much. I may give this a try. Not sure if it was user error or lens as I said. I appreciate the help.


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mr2step
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Feb 13, 2014 11:33 as a reply to  @ mr2step's post |  #10

Hey guys- Ok so on the great advice of Paddler4 I tried to do some basic testing to see what I could find out. I did not do as exhaustive a testing as was presented in the link though I did do something comparable. basically, I printed up a calibration sheet as per this site and followed it's instructions using both live view and autofocus systems to try and see what is going on. I shot on a tripod using mirror lock up and a wired trigger release. I was shooting 6 feet from the wall. I began by shooting at f2.8 using both live view and autofocus methods as described in the site. Right off the bat I could tell there was something wrong as both images were VERY fuzzy when zoomed in to 100%. So, I then upped the aperture to 4.0 and repeated steps. Images were obviously more clear then at 2.8 but still not tack sharp. I then changed aperture again to f8.0 and this is where the image began to become sharp to my liking. To keep moving things further, I put on my 55-250 canon lens and did the same steps. I used same focal range of 75mm and same aperture to help with reproducibility. Immediately the images were tack sharp. After viewing the 2 lenses images side by side it was like night and day. I think I have narrowed down the issue to the lens which is what my suspicion was all along along and feel fairly confident that it is NOT the camera body. I am still contacting tamron as this lens is out of warranty. As I think I mentioned, I was quoted at $150 for a minor repair and $250 for major repair. Not sure what a lens calibration would fall under but either way, it would still be cheaper then buying a new lens. I will try and post pictures when i can upload them so others can see what I am looking at and hopefully make it a learning experience for others.
Here is the web address i used
http://photographylife​.com …dslr-for-autofocus-issues (external link)


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Tamron 28-75 2.8 XR Di focus problems?
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