dcmiller wrote:
There is no posted evidence of a problem with this lens. The non-shaky images posted to prove a problem with this lens show the opposite. There is a misunderstandings about AF and basic of photography.
Why don't you answer my pointed questions to you on the last page. And while you're at it, answer why the 50/1.4 in identical conditions focuses perfectly while the 50/1.2 does not. And for the record, the same issue occurs when using the camera-assisted manual focus. The only focusing that will give accurate results with the 50/1.2 at these distances is split screen.
First I want to thank you everyone here who tested this lens thoroughly and posted their finding about this focusing problem.
Today, I saw through the internet, one of a camera shop here has a 50 1.2 L in stock. I was so excited I took a drive there to test the lens. the first thing I did was taking my brother's face close up wide open. The bokeh was beautiful, and the sharpness is very good.
I almost bought the lens when I remembered this thread, so I close down the aperture to F4 and shoot again. I was totally heart broken when I saw the focusing was off to the eye further from my camera.I tried a couple more times and got the same result.
I know I'm not a pro or an expert, but I've never had this kind of problem with my other L primes or any other of my lens . I can get my 35 L, 85 L, 135 L to focus accurately, wide open at minimum working distance and they all have paper thin dof at MWD wide open. So I am quite confident to say that if I can't get the 50L nail the focus at F4, it's the lens problem.
I really really want this lens...I hope Canon will do something about this soon
Please pardon my English. It's not my first language
Sam Bennett wrote:
Why don't you answer my pointed questions to you on the last page. And while you're at it, answer why the 50/1.4 in identical conditions focuses perfectly while the 50/1.2 does not. And for the record, the same issue occurs when using the camera-assisted manual focus. The only focusing that will give accurate results with the 50/1.2 at these distances is split screen.
while he's at it, dcmiller can also answer why my $75 50/1.8 mkII under 100% identical conditions autofocused perfectly while all three copies of my $1600 50/1.2L did not.
dcmiller wrote:
Sorry, didn't see the questions. I don't have psychic knowledge of your lenses. I do see images demonstrating properly working lenses and AF system.
You don't need knowledge of my lenses to answer the question, just as you didn't need psychic powers to make spurious claims about what's going on AF point wise. All you're doing is using confirmation bias to support an a priori conviction about what's going on. I hope you can understand why this is insulting to me, considering the time I've invested and the care I've given to help this forum better understand the problem.
Sam Bennett wrote:
And so why did it select the shadow only in the 2.8 shot? And why did it focus perfectly for all three f/1.4 shots and misfocus for the f/2.8 shots, even though the position of the point never changed?
The 1.4 shot is soft enough that I'm not sure of the exact center of focus. You may be assuming the center more towards the front than it really is. The lines closer to the camera have more resolution, and would naturally appear sharper. Stopped down, when the lens sharpens up, the effect of resolution on sharpness becomes less important.
If you refocued between shots without moving the camera, I wouldn't be surprised if the focus moved a little bit.
flatdraft wrote:
while he's at it, dcmiller can also answer why my $75 50/1.8 mkII under 100% identical conditions autofocused perfectly while all three copies of my $1600 50/1.2L did not.
Sam Bennett wrote:
You don't need knowledge of my lenses to answer the question, just as you didn't need psychic powers to make spurious claims about what's going on AF point wise. All you're doing is using confirmation bias to support an a priori conviction about what's going on. I hope you can understand why this is insulting to me, considering the time I've invested and the care I've given to help this forum better understand the problem.
Interesting response. The more we talk about how cameras work, the more you want to talk about feelings.
dcmiller wrote:
Sure, where are those pics posted?
they're on a CD en-route to CPS for canon's own research and record. there's no need for me to post them publicly as i don't need anyone else to tell me that my lens has (had) issues. i'm perfectly capable of making that decision on my own. i've owned 75+ canon lenses (many multiple times and most of which were Ls) and the 50L is absolutely the first one i've had with AF issues over three different copies of various date codes.
flatdraft wrote:
they're on a CD en-route to CPS for canon's own research and record. there's no need for me to post them publicly as i don't need anyone else to tell me that my lens has (had) issues. i'm perfectly capable of making that decision on my own. i've owned 75+ canon lenses (many multiple times and most of which were Ls) and the 50L is absolutely the first one i've had with AF issues over three different copies of various date codes.
-erik
Then why did you ask me to explain? I asked to see the shots in response to your question. My psychic abilities do not include seeing images on remote CDs.
dcmiller, with all due respect, you should consider yourself lucky if your lens performs up to your expectation, and simply bow out of this thread. You seem to be trying to inflame the situation, or insult the rest of us that HAVE experienced these strange issues.
And just because individuals do not want to share their images with you do not make any of their claims less valid. Because in reality the only people we need to prove anything to is Canon.
Radiohead wrote:
Has anyone yet had a productive conversation with Canon about this - ie. have they acknowledged there is an issue?
Canon is aware of the situation and I have spoken with various Canon personel on a number of occasions. Canon has yet to make an official statement on anything, however has acknowledged our concerns.
I would imagine with PMA coming up, they cannot devote as much time as they'd like to this potential issue until PMA is finished.
h4y4sh1 wrote:
First I want to thank you everyone here who tested this lens thoroughly and posted their finding about this focusing problem.
Today, I saw through the internet, one of a camera shop here has a 50 1.2 L in stock. I was so excited I took a drive there to test the lens. the first thing I did was taking my brother's face close up wide open. The bokeh was beautiful, and the sharpness is very good.
I almost bought the lens when I remembered this thread, so I close down the aperture to F4 and shoot again. I was totally heart broken when I saw the focusing was off to the eye further from my camera.I tried a couple more times and got the same result.
I know I'm not a pro or an expert, but I've never had this kind of problem with my other L primes or any other of my lens . I can get my 35 L, 85 L, 135 L to focus accurately, wide open at minimum working distance and they all have paper thin dof at MWD wide open. So I am quite confident to say that if I can't get the 50L nail the focus at F4, it's the lens problem.
I really really want this lens...I hope Canon will do something about this soon
Please pardon my English. It's not my first language
NB : the Lens date code was UT 11xx
Edited by h4y4sh1 on Feb 10, 2007 at 11:07 PM GMT...Show more →
You probably got a copy that one of these guys sent back. lol
RoyPertchi wrote:
Does anybody know if there is talk about this on any other photo forum?
The only other large scale forum with a Canon user base like FM that I know of is DPR, and there has been some talk but not a lot. There hasn't been a lot of talk over the new 50 in general.
Since so many users here are members on every other forum, I would think it would be likely that there would be some talk, however since we have this consolidated thread, it is much more prevalent here.
eeprete wrote:
dcmiller, with all due respect, you should consider yourself lucky if your lens performs up to your expectation, and simply bow out of this thread. You seem to be trying to inflame the situation, or insult the rest of us that HAVE experienced these strange issues.
And just because individuals do not want to share their images with you do not make any of their claims less valid. Because in reality the only people we need to prove anything to is Canon.
you addressed me, remember?
Inflame is interesting. Does inflame me "critical thought about what's being presented"? Several years ago DavidP posted literally thousands of times about his 1D and lenses front focusing and back focusing. Amazingly, he could carry on a civil conversation about his results. He could defend and analyze the results.
If you want to post results in a public forum to support a conclusion, you better be prepared for debate. If you want to be sure of approval, send them to you mom.
I addressed a lot of people. What would you like me to do about it?
However, it's sad how this thread has sunk to an all time low with the mud-slinging and questionable attitude that some have taken towards other users, questioning their skillset, abilities, etc etc.
I have tried to take a pro-active approach for many, and took the initiative to contact Canon weeks ago with information pertaining to this potential "issue". I hesitate to call it a problem as who knows how many users have had an issue and how many may be out there unbeknowst to the possibility of their being one.
Canon is aware on multiple levels of this interesting characteristic of this lens, however me not being Canon I cannot comment for them. That is what they have press releases, media advisories, customer service, and recalls for (not to say there is one to be done in this case).
The saddest part of all, is I came to FM several years ago because of the higher 'class' and quality of people (and information) here, however it doesn't seem to be the case any more.
Anyone that wishes to have me keep them informed on what I hear from Canon, drop me an email, I'll be more than happy to pass on any info I get. I think I am through with this thread.
Debate? there is no debate to be had. Several users have had issues with lenses. Some have presented images, some have not.
If you business card happens to have a Canon logo on it, feel free to call me. I'd be more than happy to buy lunch at a diner down the block from Canon HQ, then you can show me my lens is not backfocusing and how it must be user error.
