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02/10/2007 04:41:33 PM · #1 |
So I have my Rebel XT and the Tamron 28-75 2.8.....before I purchases this combination, I read that a lot of people have front focusing problems with it, and I too have this. It is definitely more noticeable on closeup shots, but it's still anoying when I'm editing in Photoshop and view a picture at 100% and can see the things right infront of my subject being perfectly clear, and my subject just a tad bit out of focus.
I've read that you can send in your camera and lens to Canon and get it re-calibrated or something like that.... But my question is, if I send it in and have this done, does it mean that all the rest of my lenses will be off? I have the 50 f1.8 which is perfectly sharp, and the kit lens is too, but I'd rather use my Tamron for it's higher quality....but don't want to have future lenses be hurt because of getting it fixed... |
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02/10/2007 06:44:49 PM · #2 |
Sounds like you are not focusing on the subject but instead getting a focus point on one of the foreground objects. Make sure you center the subject when focusing and then shift the camera for composition before operating the shutter.
The only adjustment inside the camera is a hex socket head screw that is not easy to reach. The focus is determined by a special sensor beneath the mirror assembly and it's going to use the same criteria for focusing regardless of the auto-focus lens used. IMO your technique is more to blame than the lens. |
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02/10/2007 07:57:05 PM · #3 |
| No, it really is the lens.... Most any reviews of this lens are followed by comments of owners who have front focusing problems. Even if I have it tripod-mounted, and lay a ruler on the ground and shoot at a 45 degree angle...it is clear to see it is focusing closer than what I am. And it is just this lens...as I wrote, my 50mm and 18-55 are dead on. |
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02/10/2007 09:04:06 PM · #4 |
If I understand what I've read correctly in the past, you need to send the camera and lens to TAMRON. They will calibrate the LENS to your camera. Not the other way around.
Message edited by author 2007-02-10 21:04:20. |
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02/11/2007 08:32:27 AM · #5 |
ahah. That does seem to make more sense :) Thank you for that, I will contact them and see what they say.
Kevin |
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02/11/2007 09:57:41 AM · #6 |
i'd likely sell the lens and buy one that is made properly to begin with.
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