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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 22 Jun 2014 (Sunday) 19:27
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Tamron 17-50 non-VC Canon 400D auto focus problems

 
KeeTom
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Jun 22, 2014 19:27 |  #1

Hi all,

I am new to this forum so apologies in advanced for nooby comments.
I have recently purchased a Tamron 17-50mm non-VC lens for my Canon 400D body. I have had the body for several years now.
I am struggling with the auto focus on this lens with some images being totally blurry whilst some are tack sharp. I do not know whether this is user error or lens / body related problems and I do not know how to begin diagnosing.
If anyone can help it would be much appreciated.
Here are two sample photos I took today, one good one bad taken right after each other with identical settings.


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Cheers
Kieran



  
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Left ­ Handed ­ Brisket
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Jun 22, 2014 20:45 |  #2

Welcome.

I had that lens for years. While I really liked it, auto focusing was its weak point.

How is your camera's focusing system set up?


PSA: The above post may contain sarcasm, reply at your own risk | Not in gear database: Auto Sears 50mm 2.0 / 3x CL-360, Nikon SB-28, SunPak auto 322 D, Minolta 20

  
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Steveod
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Jun 23, 2014 03:02 |  #3

I have had the same with my Tamrom 17-50 non VC and 400D focus does not always hit the mark as well as my EF USM Canon stuff. I also have the SP 70-300 VC which is about the same weather on my 400D or 1Ds
. I find that I can tell through the veiw finder if they have not hit the mark and just refocus and live with it as I know after several years that there is nothing the will beat the Canon USM stuff no matter how old it is.


Steveod:shock: 1D Classic,1Ds, 400D. EOS-1n, EOS-5 Minolta Autocord,Yashica-A,Yashica-mat 66 Yashica-mat 124G ,Rolleicord IV & VB ,Mamiya C3,Mamiya C33, and a heap of other gear I keep collecting and collecting,Hi I am Steve and I am a photoholic http://www.flickr.com/​photos/steveod2007/ (external link)

  
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KeeTom
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Jun 23, 2014 04:38 |  #4

Hi both thanks for the quick replies.
Interesting you have both had the same problem. Its a shame because I spent several months researching a lens to buy and this problem never really came up in reviews.
I find it difficult to see if it has focused properly through the view finder and the 400d screen is quite small so is sometimes difficult to tell on that too.

In terms of focusing set up I have played around with settings a bit but I am using Auto-Focus on the lens, AI FOCUS (but the same problem happened with ONE SHOT focus) and I have tried both a single central AF Point Selection and an Automatic selection - they both seem to suffer this focusing issue.

Are there any other settings I should play about with?

Cheers
Kieran




  
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watt100
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Jun 23, 2014 04:46 |  #5

KeeTom wrote in post #16988865 (external link)
Hi both thanks for the quick replies.
Interesting you have both had the same problem. Its a shame because I spent several months researching a lens to buy and this problem never really came up in reviews.
I find it difficult to see if it has focused properly through the view finder and the 400d screen is quite small so is sometimes difficult to tell on that too.

In terms of focusing set up I have played around with settings a bit but I am using Auto-Focus on the lens, AI FOCUS (but the same problem happened with ONE SHOT focus) and I have tried both a single central AF Point Selection and an Automatic selection - they both seem to suffer this focusing issue.

Are there any other settings I should play about with?

Cheers
Kieran


I have used the Tamron 17-50 2.8 non-vc with the 450D and 60D and did not experience focusing problems. I would try it with the center AF point, single shot




  
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Left ­ Handed ­ Brisket
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Jun 23, 2014 05:06 |  #6

watt100 wrote in post #16988871 (external link)
I would try it with the center AF point, single shot

I would suggest the same.

And when I said above that focusing was its weak point, I did not mean that I had lots of misses. In good light and single point, focus was pretty good. I did kind of get in a habit of doing a half press, letting go, and doing another half press before firing.

In low light, focusing was pretty bad. I was using it on my XSi/450D


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KeeTom
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Jun 23, 2014 07:23 |  #7

OK I'll give it a go.
I was having a play around last night at night time indoors with artificial light and it was terrible. I'll give it a go today outside in the sun see how I get on.

Cheers for the help




  
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MakisM1
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Jun 23, 2014 08:54 |  #8

I would like to add, if I may, that a clean, white car's hood, in bright sunshine is not the best AF target for any lens. You need to pick targets with contrast, sometimes by focus/recompose.


Gerry
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KeeTom
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Jun 26, 2014 05:13 |  #9

Yeah I guess it could be the object but it happens with other subject that aren't shiny white etc.




  
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Sibil
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Jun 26, 2014 06:52 as a reply to  @ KeeTom's post |  #10

Do you get focus confirmation beep and still get OOF shots? Bumping the shutter may help.




  
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KeeTom
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Jun 30, 2014 04:44 |  #11

Yeah I get the focus confirmation. Everything seems normal until I get the photos onto my PC.
What do you mean by bumping the shutter sorry?




  
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Sibil
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Jun 30, 2014 07:30 |  #12

KeeTom wrote in post #17002619 (external link)
What do you mean by bumping the shutter sorry?

Bumping the shutter means pressing the shutter half-way, for more than once.




  
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KeeTom
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Jun 30, 2014 09:36 |  #13

Sibil wrote in post #17002752 (external link)
Bumping the shutter means pressing the shutter half-way, for more than once.

Oh right cool no I have not tried that. I will give it a go, thanks.




  
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groundloop
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Jun 30, 2014 10:45 as a reply to  @ KeeTom's post |  #14

What's the shutter speed in that first photo? In looking at it I can't find any area that appears sharp, I'm wondering if maybe it's motion blur due to too low of a shutter speed. Either that or the camera missed focus by a ton.

I used to have that lens and was happy with it, never had any focus issues as long as the light was at least half way decent.




  
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KeeTom
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Jun 30, 2014 12:44 |  #15

groundloop wrote in post #17003062 (external link)
What's the shutter speed in that first photo? In looking at it I can't find any area that appears sharp, I'm wondering if maybe it's motion blur due to too low of a shutter speed. Either that or the camera missed focus by a ton.

I used to have that lens and was happy with it, never had any focus issues as long as the light was at least half way decent.

The shutter speed is exactly the same in the first photo as the second. It is not a shutter speed issue the lens just doesn't seem to focus on anything.




  
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Tamron 17-50 non-VC Canon 400D auto focus problems
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