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Thread started 15 Jan 2011 (Saturday) 21:11
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And the Sigma auto focus issues continue !

 
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Jan 16, 2011 21:38 |  #76

mdgrwl wrote in post #11655479 (external link)
huh???

Nice try, removing your 3 prime, 50 1.5 post... you typod no biggie, not worth deleting though


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Jan 16, 2011 21:42 |  #77

mdgrwl wrote in post #11655455 (external link)
Yeah, I'm done with Sigma. I can't take the focus shifts.

I'm going to stick to all Canon. No need to worry about "reverse engineering", and the slight (to my eyes) difference between the Canon vs. Sigma variants aren't worth it to me.

I'm going to add the 50mm 1.4 this week.

Then I'm still trying to decide between the 28mm 1.8 or 135L. The 135L seems wonderful, but not sure the focal length will work for me.

you really are in for a wake up if you think Sigma is the only ones with focus problems and bad copies..Just cause it has Canon printed on it doesnt mean its going to be perfect. Oh one flaw with the 85 1.8 granted it may be nice and fast and I owned one but if you get in a high contrast shot shooting around 1.8-2 it purple fringes like a MOFO..hope you dont sell it cause of that
I am getting a little pissed with this 7D. My 24-70L isnt as accurate..it varies shot to shot now if it gets perfect focus..I NEVER once had that issue with the 1D3 of mine. Maybe I should sell the 7D and go to nikon cause they NEVER have any focus problems.


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Jan 16, 2011 21:44 |  #78

05Xrunner wrote in post #11655533 (external link)
you really are in for a wake up if you think Sigma is the only ones with focus problems and bad copies..Just cause it has Canon printed on it doesnt mean its going to be perfect.
I am getting a little pissed with this 7D. My 24-70L isnt as accurate..it varies shot to shot now if it gets perfect focus..I NEVER once had that issue with the 1D3 of mine. Maybe I should sell the 7D and go to nikon cause they NEVER have any focus problems.

yes sir, a big wake up call !!

my Canon 17-55 required -9MA and my new 85mm 1.8 required -8MA - i'll probably return them now.

listen, all kidding aside, as long as they don't focus shift like the Sigma (hit or mis the same exact shot), and require a little MA, i'm cool. just dont miss 50% of the shots, and i'm happy.




  
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Jan 16, 2011 23:38 |  #79

mdgrwl wrote in post #11655537 (external link)
my Canon 17-55 required -9MA andmy new 85mm 1.8 required -8MA - i'll probably return them now.

I thought you said your 85mm f/1.8 performs flawlessly:rolleyes:

"and yes,i just got new Canon 85 1.8 that performs flawlessly thus far.


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Jan 16, 2011 23:40 |  #80

I think it "shifted"


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Jan 17, 2011 00:09 |  #81

I'm amazed by your amount of bad luck.
Testing 11 lenses and all of them bad. That truly is amazing.
I'd almost think that would be a world first.
Can't imagine what the odds of that happening would be.
Just hope you don't walk under a ladder or a black cat doesn't cross your path.


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Jan 17, 2011 00:16 |  #82

Me thinks you should of stayed with the 60D so you would stop MA'ing every lens


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Jan 17, 2011 03:57 |  #83

So the 85mm is working wonders, huh? Check back in a week, cause you posted this about your sigma a week ago:

mdgrwl wrote in post #11574597 (external link)
Alright guys, got a near perfect sigma and I'm extremely happy. I tested 9 in the store just because I'm a nut job. Some were bad, some were okay, but one jumped out at me as just about perfect!

I don't feel like getting into my testing, my set up, and so on because I've learned it will just be nitpicked apart, and I don't feel like writting a short book on everything I did, and then responding to every post of nay sayers.

Bottom line is though, the Sigma (if you get a consistent focusing one) is a VASTLY superior lens to Canon's 50mm 1.4.

I'm stunned by this lens.

Seriously, take two seconds to look at it from an outside perspective, and realize you are the only constant variable here...


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Jan 17, 2011 05:04 |  #84

Jeez, this used to be such a friendly place :(

yogestee wrote in post #11656150 (external link)
I thought you said your 85mm f/1.8 performs flawlessly:rolleyes:

Are you deliberately trying to misunderstand the OP? It's pretty obvious that he's talking about consistency, and doesn't consider the need for MFA a problem.

DreDaze wrote in post #11656954 (external link)
So the 85mm is working wonders, huh? Check back in a week, cause you posted this about your sigma a week ago:

If you read the early posts in this thread you'll see that his original testing was at short distances, and the problem only occurred at longer ones (which he didn't try until later).


If I were the OP, I'd just bail out of this thread, since it doesn't look like there's anything constructive happening any more, and people are just looking for things to criticise!


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Jan 17, 2011 05:56 |  #85

GC, the OP refuses to accept that the only constant in his "testing" is himself.
Can you honestly say to yourself that there is not even the slightest possibility that equipment is not the problem but the operator is...
11 consecutive lenses that are "faulty" - I seriously doubt it.
Several different bodies that are "faulty" at the same time lenses are - I doubt that too.

Maybe you should have a look at these threads by the OP.
Firstly this...https://photography-on-the.net/forum/showthre​ad.php?t=984731
and this one
https://photography-on-the.net/forum/showthre​ad.php?t=980470
both preceeded by this one...
https://photography-on-the.net/forum/showthre​ad.php?t=980364

Hmm...multiple bodies AND lenses with focusing issues even after micro adjusting, all used by the same person.

GC, can you not see a pattern here?


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Jan 17, 2011 06:34 |  #86

I've expressed no opinion on whether it's an equipment problem or user error although (as this thread has entered the 'adversarial' stage) I was confident someone would assume that I had :)

I just hate it when threads go this way - people start looking for ways to interpret what someone has posted that allow them to ridicule the poster. That's more the dpreview way than POTN, I think.


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Jan 17, 2011 07:06 |  #87

yogestee wrote in post #11656150 (external link)
I thought you said your 85mm f/1.8 performs flawlessly:rolleyes:

flawlessly as in, just about perfect regarding the topic were discussing - focus.




  
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Jan 17, 2011 07:11 |  #88

gcogger wrote in post #11657091 (external link)
Jeez, this used to be such a friendly place :(

Are you deliberately trying to misunderstand the OP? It's pretty obvious that he's talking about consistency, and doesn't consider the need for MFA a problem.



If you read the early posts in this thread you'll see that his original testing was at short distances, and the problem only occurred at longer ones (which he didn't try until later).


If I were the OP, I'd just bail out of this thread, since it doesn't look like there's anything constructive happening any more, and people are just looking for things to criticise!

Thank you! Jeeze... I'm just being all out attacked here. Thanks for actually reading my post...




  
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Jan 17, 2011 07:14 |  #89

philwillmedia wrote in post #11657187 (external link)
GC, the OP refuses to accept that the only constant in his "testing" is himself.
Can you honestly say to yourself that there is not even the slightest possibility that equipment is not the problem but the operator is...
11 consecutive lenses that are "faulty" - I seriously doubt it.
Several different bodies that are "faulty" at the same time lenses are - I doubt that too.

Maybe you should have a look at these threads by the OP.
Firstly this...https://photography-on-the.net/forum/showthre​ad.php?t=984731
and this one
https://photography-on-the.net/forum/showthre​ad.php?t=980470
both preceeded by this one...
https://photography-on-the.net/forum/showthre​ad.php?t=980364

Hmm...multiple bodies AND lenses with focusing issues even after micro adjusting, all used by the same person.

GC, can you not see a pattern here?

Listen - the 8 Sigma lenses at the store my very well have been perfect for all I know!
There, I said it!

The only reason I didnt' walk home with one of those is my 60D had no MA, and I saw a slight back/front focus in all of them. Front/back focusing is very popular with all lenses, even Canon. So perhaps I could of just went home and did a slight MA adjustment and the lens would of been perfect. But I didn't have the 7D then, so we'll never know.

So really, were only considering 3 lenses. 2 Canon 50 1.4's (which I feel is just not for me, too soft). And 1 Sigma.

Guys, its not impossible to get a soft Canon 50 1.4's. Its that lenses trait. And its certinly not impossible to have 1 bad Sigma.




  
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Jan 17, 2011 07:15 |  #90

mdgrwl, I think you should give your lenses a bit more time. None of us but you can assess whether or not your lens is malfunctioning, but you've had a huge amount of faulty lenses compared to the average photographer. This could be bad luck - of course - but statistically speaking the chances that this would happen to you over and over again are extremely slim.

I see that you get into a defensive position very fast here on the forums, why is that? For us people who are just really getting acquainted with photography it's always a good idea to listen to the more experienced photographers - even if it's not always what we want to hear. Preconceptions like "my lens is bad" or "it's absolutely not me" (I didn't literally quote this, this is just my interpretation of your replies) will lead nowhere, maybe it's a better idea to ask "what is this and how can I fix this?" instead? This will probably not only lead to more constructive criticism, but you (and others with the same issue) are likely to learn a lot more. A good example of this is the recomposing that you do, as this may very well be part of the issue at hand. In my opinion this is too easily dismissed, I would have tremendous difficulty focusing and recomposing at such large apertures.

Maybe your expectations are too high? As a new lens has warranty, maybe it's an idea to just shoot with your next purchase for half a year or so before jumping to conclusions? If you're still unhappy by that time, you can send it in for calibration under warranty.

Meanwhile you can work on your technique (I'm not saying it's bad now - your technique should just always be improving) and be happy with the keepers that you do get. As long as this is something you do for fun, as a hobby, the most important thing is to have fun with your gear. You seem to be at the point now where you're second-guessing your gear to start with and that's simply no fun at all.

Have fun with your new lens! :D


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And the Sigma auto focus issues continue !
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