mike_gendimenico Posted June 3, 2008 Share Posted June 3, 2008 I normally use a 5D for much of my photography, but wanted something smaller andlighter for general travel photography, so I recently picked up an XSi and aTamron 28-300 VC lens (also have a Rebel XT). I've noticed that many photos are out of focus when using the 9 point AF. If Iuse just manual center point auto focus the pictures are much better (AF Mode isset to One Shot & operating in Program Mode). I used it today on some productgirls at a trade show and got the same result - slightly out of focus in 9 pointmode, good focus in center point mode. Never had this problem with the Rebl XT or 5D. Any suggestions? Thanks! Link to comment Share on other sites More sharing options...
digitmstr Posted June 3, 2008 Share Posted June 3, 2008 For one thing: have you used that lens with other cameras? By the same token, have you used DIFFERENT lenses with your XSi? I have an XSi as well an focus is spot on. Your post is a bit vague and without and actual sample image it's hard to suggest much. Link to comment Share on other sites More sharing options...
chris_adams11 Posted June 3, 2008 Share Posted June 3, 2008 I will almost always pick my focus point and move it around depending on where the subject is. With the 9 point autofocus on there is no telling what the camera is focusing on. If there is something in the backround with a little more contrast it might pick that up. I would stick to using a single point and your results should be better. Link to comment Share on other sites More sharing options...
stillbound Posted June 3, 2008 Share Posted June 3, 2008 I totally agree with the two follow up's so far. Multi point AF is for very rare instances in my opinion and those long multi purpose small aperture lenses are never going to focus as fast as a normal length lens... Link to comment Share on other sites More sharing options...
ajb2222 Posted June 3, 2008 Share Posted June 3, 2008 SInce you have another camera, try the lens on that camera and see if you have the same problem. If you do it is the lens. Also try a different lens on the XSi and see if you still have the problem. maybe it is a compatablity issue with the Xsi and the tamron lens. Link to comment Share on other sites More sharing options...
Brad_ Posted June 3, 2008 Share Posted June 3, 2008 I use an XSi and 9 point AF for street photography (like I've been doing for years with my 20D) and have no issues. It's a great cam... www.citysnaps.net Link to comment Share on other sites More sharing options...
steve_dunn2 Posted June 3, 2008 Share Posted June 3, 2008 <p>On what is the camera focusing when you use automatic focus point selection? I don't know if the XTi shows this in the viewfinder; at least some Canon file viewer/converter utilities can show you (EVU can, for instance). Maybe it's choosing a different part of the picture than what you think the subject is.</p> Link to comment Share on other sites More sharing options...
mike_gendimenico Posted June 4, 2008 Author Share Posted June 4, 2008 Unfortunetley, I got the XSi at the last minute, could only take the Tamron lens, and am 6000 miles from home, so haven't had a chance to interchange cameras and lenses for further testing. The pictures seem to be much better now that I've changed to center point focus at least. I've uploaded comparison photo crops here. Two different subjects, but same shooting and settings except the right image is 9 point AF, left is center point focus. I do have to say I'm so used to using my 5D that the Rebel is taking some getting used to.<div></div> Link to comment Share on other sites More sharing options...
xingyuan_wang Posted December 8, 2008 Share Posted December 8, 2008 <p>Did you find out anything more -- has the center AF point worked for you?<br> I think I'm having some front-focus issues on my XSi.</p> <p>Neat subject, btw. :)</p> Link to comment Share on other sites More sharing options...
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