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[Official] OCN Camera Thread - Page 1588

post #15871 of 29551
Quote:
Originally Posted by xxrabid93 View Post
So i got my Canon 70-200 2.8 a while ago. I haven't had much time to shoot, but i did some focus testing. It seems to back focus more so a 70mm than 200mm. It is noticeable at 70mm, and barely noticeable at 200mm.

I first tested it by just focusing on various items, and then i did a focus sheet test as shown here: http://www.bobatkins.com/photography...s_testing.html. Both shooting items, and the focusing sheet showed some back focus at 70mm and a little bit a 200mm. I setup everything correctly for the focusing test, and focused on the middle line. For reference, on the focus sheet in that link, at 70mm, the far 3 (or a little past it, maybe like a 4 or 5) would be the most in focus, and at 200mm, the far 1 would be the most in focus.

Any insight? Should i try and send it to Canon to get it calibrated? How much would that cost? How much would it cost to calibrate to my body, not just a general spec calibration?

Thanks
Anyone? This thread always has so much activity so my posts seem to get buried alot.
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post #15872 of 29551
I did not send my body in with it. I asked the last two times and they told me that's not necessary because it does the same thing on both bodies. I dunno if that's right, that's just what the guy on the phone told me.

The funny thing is, the first time I sent it in, they told me "the adjustment of the AF assembly was incorrect. The AF did not operate properly. Electrical adjustments were carried out on the AF assembly and product functions were confirmed"

Now, the paper I got today says "your product has been examined and it was found that the lens assembly did not operate properly causing the focus to operate improperly" Now how in the hell did it work when it left the first time, but not a week later when they got it back because it was still broken?

I also don't think it would be a good idea to sell it, since I really do think something is wrong with it and I don't want to screw someone that would be getting a lens that potentially doesn't function correctly.
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post #15873 of 29551
Thread Starter 
Quote:
Originally Posted by xxrabid93 View Post
Anyone? This thread always has so much activity so my posts seem to get buried alot.
Got any real-world examples illustrating the problem? You can e-mail Canon and at least get a quote.

Quote:
Originally Posted by ljason8eg View Post
I did not send my body in with it. I asked the last two times and they told me that's not necessary because it does the same thing on both bodies. I dunno if that's right, that's just what the guy on the phone told me.

The funny thing is, the first time I sent it in, they told me "the adjustment of the AF assembly was incorrect. The AF did not operate properly. Electrical adjustments were carried out on the AF assembly and product functions were confirmed"

Now, the paper I got today says "your product has been examined and it was found that the lens assembly did not operate properly causing the focus to operate improperly" Now how in the hell did it work when it left the first time, but not a week later when they got it back because it was still broken?

I also don't think it would be a good idea to sell it, since I really do think something is wrong with it and I don't want to screw someone that would be getting a lens that potentially doesn't function correctly.
Wow, I would definitely make a big stink, but that's me. As I said, demand a brand new replacement or refund barring that.
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post #15874 of 29551
Just to illustrate what I'm dealing with here, here's two shots at f/2.0, 7D on a tripod. Focus is on the knot in the tree trunk. The first shot is live view 10x, the second is through the viewfinder with spot focus. Check them out at original res, though its even apparent at much less.


Focus test-live view by JLofing, on Flickr


Focus test-viewfinder by JLofing, on Flickr
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post #15875 of 29551
Hah! Same thing my 85 did, and that took 2 trips to Canon before it was right.

Also, interesting note, my Nifty takes +20 on the 50D, but 0 on the 1D and 1N. Weirdness.
post #15876 of 29551
Quote:
Originally Posted by sub50hz View Post
Hah! Same thing my 85 did, and that took 2 trips to Canon before it was right.

Also, interesting note, my Nifty takes +20 on the 50D, but 0 on the 1D and 1N. Weirdness.
I'm glad I'm not the only one that has had a problem like this lol!

I wish MA would fix my problem. Thing is, its spot on from MFD to 7-8 feet, then goes to hell.
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post #15877 of 29551
Does canon not test their lenses or something? This seems way too common.
 
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post #15878 of 29551
Quote:
Originally Posted by foothead View Post
Does canon not test their lenses or something? This seems way too common.
If I had to chalk it up to anything, it would be the variety of AF systems in EF bodies, even in the current lineup. Most of them are anomalies, and it really isn't as prevalent as you think.
post #15879 of 29551
Yeah I don't think its a widespread thing. The silent majority is busy having fun shooting with lenses that AF correctly while the vocal minority is busy on a forum *****ing about their copy that doesn't.
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post #15880 of 29551
Thread Starter 
Quote:
Originally Posted by ljason8eg View Post
Yeah I don't think its a widespread thing. The silent majority is busy having fun shooting with lenses that AF correctly while the vocal minority is busy on a forum *****ing about their copy that doesn't.
Very true, a fact which calls into question how frequent Sigma lens issues are.
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