Frontfocusing?

Ok,
I have tired of making sure that my settings are right only to have the pic OOF. Here's an instance. The focus point is on the left red sleeve (your right) of my 2 year old. Let me know if this is an issue of frontfocusing. I think it is. The link is the same image only larger.

http://img369.imagesha​ck.us …3708/img68811la​rgesu8.jpg

It’s very difficult to judge if this was front focusing.
Why don’t you try this test?

http://focustestchart.​com/chart.html

Remember that the focus points are a bit larger than the rectangle in the viewer.

asysin2leads wrote in post #3892237
Ok,
I have tired of making sure that my settings are right only to have the pic OOF. Here's an instance. The focus point is on the left red sleeve (your right) of my 2 year old. Let me know if this is an issue of frontfocusing. I think it is. The link is the same image only larger.

http://img369.imagesha​ck.us …3708/img68811la​rgesu8.jpg

According to what you say and the image, I would say definitely; look at the grass behind his feet and compare the depth of field behind vs. in front.

As posted by another member in a thread I currently have running regarding my possibly bad 70-200 F4 L:

http://focustestchart.​com/chart.html

Would be worth checking mate

I've seen the test chart. Just haven't downloaded it yet. Was going to tonight. I believe it it front-focusing. Now for my second question. Is it the lens or the body that is responsible for front-focusing? I'm using a rented 70-200 (thanks Michael at lensestorent.com). I can't ship that off to Canon. UGH! Thanks for all the replies, though.

looks in focus to me, sometimes you focus on something else (in this case the blue shirt). af sensors are larger than they appear, especially on the 350d

To detmerine if the camera is front-focusing, you need to try a focus test - like the focusing chart - with many different lenses. Don't bother with the kit lens -- in my tests of 10 different lenses, it was the only one that didn't show front-focusing with my 350D.

JackProton wrote in post #3896048
Don't bother with the kit lens -- in my tests of 10 different lenses, it was the only one that didn't show front-focusing with my 350D.

What did the kit lens show? Correct focus? Suppose that means it was back focusing to match your camera's front focus?

-js

asysin2leads wrote in post #3894766
I've seen the test chart. Just haven't downloaded it yet. Was going to tonight. I believe it it front-focusing. Now for my second question. Is it the lens or the body that is responsible for front-focusing? I'm using a rented 70-200 (thanks Michael at lensestorent.com). I can't ship that off to Canon. UGH! Thanks for all the replies, though.

You have enough in the way of lenses that you should be able to determine whether the problem lies with the body or the lens.

Try the focus test with each lens. If they all frontfocus, then it's very likely that the body is at fault. If only the 70-200 frontfocuses, then it's almost certainly just that lens.

kcbrown wrote in post #3896467
You have enough in the way of lenses that you should be able to determine whether the problem lies with the body or the lens.

Try the focus test with each lens. If they all frontfocus, then it's very likely that the body is at fault. If only the 70-200 frontfocuses, then it's almost certainly just that lens.

Very good point.

number six wrote in post #3896148
What did the kit lens show? Correct focus? Suppose that means it was back focusing to match your camera's front focus?

-js

The kit lens was the only lens that showed correct focus with the test chart, yes. I put this down to the kit lens' very wide depth of focus compared to my other lenses. It showed some front-focusing at times but nothing very reproducable like, say, the 50mm f1.8 which was later verified by Canon as being in perfect calibration.

I suppose the kit lens could have been back-focusing but I never tested the kits lens again after my camera was fixed for the final time (I upgraded shortly after). After all this testing, though, I got the impression that the kit lens may have been expressly designed this way to help newbies by making focusing less critical.