Comments on: Tamron 17-50mm Front Focus http://www.randomprocess.ca/2008/12/09/tamron-17-50mm-front-focus/ NOT just another WordPress weblog. What were they thinking when they came up with that tagline anyways? Wed, 08 Feb 2012 13:45:02 +0000 hourly 1 http://wordpress.org/?v=3.3 By: Greg http://www.randomprocess.ca/2008/12/09/tamron-17-50mm-front-focus/#comment-6858 Greg Wed, 14 Oct 2009 18:51:54 +0000 http://www.randomprocess.ca/?p=1090#comment-6858 I have the 17-50mm as well, and mine seems to have the front focus problem. Did you manage to get yours fixed? Did it take a long time? Where did you have to send it in to? I have the 17-50mm as well, and mine seems to have the front focus problem. Did you manage to get yours fixed? Did it take a long time? Where did you have to send it in to?

]]> By: charlie http://www.randomprocess.ca/2008/12/09/tamron-17-50mm-front-focus/#comment-6050 charlie Wed, 08 Apr 2009 04:31:37 +0000 http://www.randomprocess.ca/?p=1090#comment-6050 Haven't had a chance to send it in yet. I'm making do with it for the moment. Further reading on the subject seems to indicate the first version without the in-lens motor performs much better from an focus point of view. Haven’t had a chance to send it in yet. I’m making do with it for the moment. Further reading on the subject seems to indicate the first version without the in-lens motor performs much better from an focus point of view.

]]> By: ML http://www.randomprocess.ca/2008/12/09/tamron-17-50mm-front-focus/#comment-6036 ML Mon, 06 Apr 2009 18:13:23 +0000 http://www.randomprocess.ca/?p=1090#comment-6036 Did you get it fixed? Did you get it fixed?

]]> By: charlie http://www.randomprocess.ca/2008/12/09/tamron-17-50mm-front-focus/#comment-5516 charlie Mon, 26 Jan 2009 22:58:10 +0000 http://www.randomprocess.ca/?p=1090#comment-5516 I figure if it was the camera front-focusing, even when manual focusing and the focused 'dot' appears for the 50mm prime, it should be slightly out of focus, but it isn't. Hence, I believe it to be the lens. As for aperture, the front-focusing much less obvious with a smaller aperture, but I think that has more to do with the fact that the DoF is larger, thus reducing the effect of the front-focus, not eliminating it. I figure if it was the camera front-focusing, even when manual focusing and the focused ‘dot’ appears for the 50mm prime, it should be slightly out of focus, but it isn’t.

Hence, I believe it to be the lens. As for aperture, the front-focusing much less obvious with a smaller aperture, but I think that has more to do with the fact that the DoF is larger, thus reducing the effect of the front-focus, not eliminating it.

]]> By: Cuong http://www.randomprocess.ca/2008/12/09/tamron-17-50mm-front-focus/#comment-5515 Cuong Mon, 26 Jan 2009 11:33:51 +0000 http://www.randomprocess.ca/?p=1090#comment-5515 And one more thing, I heard that the front focus issue only appears with max aperture. Maybe it doesn't happen with smaller aperture. And one more thing, I heard that the front focus issue only appears with max aperture. Maybe it doesn’t happen with smaller aperture.

]]> By: Cuong http://www.randomprocess.ca/2008/12/09/tamron-17-50mm-front-focus/#comment-5514 Cuong Mon, 26 Jan 2009 11:31:45 +0000 http://www.randomprocess.ca/?p=1090#comment-5514 I meant that if D40 cannot autofocus on 50 f/1.8, how comes you knew that it does not have that issue. I meant that if D40 cannot autofocus on 50 f/1.8, how comes you knew that it does not have that issue.

]]> By: charlie http://www.randomprocess.ca/2008/12/09/tamron-17-50mm-front-focus/#comment-5506 charlie Sat, 24 Jan 2009 17:28:48 +0000 http://www.randomprocess.ca/?p=1090#comment-5506 The D40 doesn't have any focus micro-adjustment capabilities like the D300 and above so there's little possibility of fixing the issue without getting it calibrated. You could see if the store you purchased the lens at has the ability to do a calibration. As for the 50mm, I stated that it <strong>does not</strong> exhibit any front focus issues. The D40 doesn’t have any focus micro-adjustment capabilities like the D300 and above so there’s little possibility of fixing the issue without getting it calibrated. You could see if the store you purchased the lens at has the ability to do a calibration.

As for the 50mm, I stated that it does not exhibit any front focus issues.

]]> By: Cuong http://www.randomprocess.ca/2008/12/09/tamron-17-50mm-front-focus/#comment-5505 Cuong Sat, 24 Jan 2009 16:37:28 +0000 http://www.randomprocess.ca/?p=1090#comment-5505 I've got the D40 and Tamron 17-50mm like you have. Mine seems to be in the same situation as yours. I want to know whether there is a way to solve this problem without changing to another one. One more thing, as you said on the other entry, you're using D40 and cannot autofocus on 50 f/1.8. So how comes can the 50 exhibit the same issue. I’ve got the D40 and Tamron 17-50mm like you have. Mine seems to be in the same situation as yours. I want to know whether there is a way to solve this problem without changing to another one.
One more thing, as you said on the other entry, you’re using D40 and cannot autofocus on 50 f/1.8. So how comes can the 50 exhibit the same issue.

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