December 18, 2014, 03:27:04 PM

Author Topic: Sigma 50mm f/1.4 DG HSM Art  (Read 28773 times)

Eldar

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Re: Sigma 50mm f/1.4 DG HSM Art
« Reply #165 on: May 16, 2014, 12:28:59 AM »
So on the fence about cancelling until issues and supplies are all worked out...But keep imagining this will be a great newborn lens...

Sure hope I'm not getting one of the lenses the OCD folk are tweaking to death and returning.  The stories here of lens churn are revolting.

Well said ...I think more than a few are over-tweaked!  8)
I am looking forward to Dustin Abbott's  review/comparison of both Sigma 50's...hope he got the Sigma Dock,too as I would like to hear what he has to say about that as well. His take is reliable, experienced, real-world and relevant. 
No measurbating.
I don't think you know what the issue is, since you don't have the lens. Read Bryan's review in TDP. He is showing the problem quite simply by photographing a flat piece of paper with a butterfly motive. You can see there, that in a series of shots, of a flat piece of paper, standing dead still, with plenty of contrast to focus on, is out of focus several times.

http://www.the-digital-picture.com/Reviews/Sigma-50mm-f-1.4-DG-HSM-Art-Lens.aspx

As for my lens, it has not been tweaked at all, because I am unable to get reliable measurements through FoCal or LensAlign and therefore have no basis for doing anything. It front focus one, back focus the next and you never know with the third.

The fact is that too many are experiencing problems with the AF on this lens. I would also think that using the supplied ability to adjust firmware, to get the focus right must be regarded as normal, not tweaking. I think Viggo would have been very happy if he could have done it once and have a stable lens thereafter.

As a note, on my L-glass, I have run every one of them through FoCal on all my bodies. They all have spot on stable AF performance after One adjustment. My 35 Art is all over the place and so is the 50 Art.
« Last Edit: May 16, 2014, 12:30:46 AM by Eldar »
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Re: Sigma 50mm f/1.4 DG HSM Art
« Reply #165 on: May 16, 2014, 12:28:59 AM »

Eldar

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Re: Sigma 50mm f/1.4 DG HSM Art
« Reply #166 on: May 16, 2014, 02:31:07 AM »
Just to follow up, this is the result from FoCal. It is 63 shots in this chart. I stopped it there, because it was (of pretty obvious reasons) not able to determine an AFMA factor.
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Viggo

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Re: Sigma 50mm f/1.4 DG HSM Art
« Reply #167 on: May 16, 2014, 02:35:47 AM »
So on the fence about cancelling until issues and supplies are all worked out...But keep imagining this will be a great newborn lens...

Sure hope I'm not getting one of the lenses the OCD folk are tweaking to death and returning.  The stories here of lens churn are revolting.

Well said ...I think more than a few are over-tweaked!  8)
I am looking forward to Dustin Abbott's  review/comparison of both Sigma 50's...hope he got the Sigma Dock,too as I would like to hear what he has to say about that as well. His take is reliable, experienced, real-world and relevant. 
No measurbating.

Wow, really? You have NO idea how this lens is. It's pretty bold to say somebody is over tweaking and almost destroying a lens because I apperantly have OCD according to some here.

I will see if I didn't delete the images from my trip out and I'll wait for you tell me if that is nitpicking or a real problem.
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candyman

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Re: Sigma 50mm f/1.4 DG HSM Art
« Reply #168 on: May 16, 2014, 02:39:50 AM »
I just wonder if people who own the Sigma 35mm f/1.4 Art have AF issues and get these results while using Focal? Or, when using the USB Dock?
For now I just used LensAlign and had to adjust +5 for frontfocus. I don't have so much time lately to really go into it but hope I can do some more checking this weekend. I did use the Dock but for firmware upgrade only.

Eldar

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Re: Sigma 50mm f/1.4 DG HSM Art
« Reply #169 on: May 16, 2014, 02:49:08 AM »
Just for comparison, this is the FoCal results for my 85mm f1.2L II on the same body (5DIII). A bit more conclusive I´d say  ::)

Comment: They are done within 10 minutes, same room, same light. The Sigma on 1.1m, the Canon on 1.4m, with the same standard FoCal calibration target.
« Last Edit: May 16, 2014, 04:10:19 AM by Eldar »
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Eldar

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Re: Sigma 50mm f/1.4 DG HSM Art
« Reply #170 on: May 16, 2014, 03:46:48 AM »
I just wonder if people who own the Sigma 35mm f/1.4 Art have AF issues and get these results while using Focal? Or, when using the USB Dock?
For now I just used LensAlign and had to adjust +5 for frontfocus. I don't have so much time lately to really go into it but hope I can do some more checking this weekend. I did use the Dock but for firmware upgrade only.
My 35 Art´s AF has not been stable. But after I updated the firmware its stability seems to have improved a lot. I´m getting fairly clean FoCal curves with it and I have not noticed the "drifting" since I updated the firmware. It will take some time for me to regain trust though ...
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wickidwombat

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Re: Sigma 50mm f/1.4 DG HSM Art
« Reply #171 on: May 16, 2014, 04:00:07 AM »
Just to follow up, this is the result from FoCal. It is 63 shots in this chart. I stopped it there, because it was (of pretty obvious reasons) not able to determine an AFMA factor.
wow thats unreal nothing like mine
my target was just printed out of a laser printer on to standard copy paper its not a proper target  :-[

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Re: Sigma 50mm f/1.4 DG HSM Art
« Reply #171 on: May 16, 2014, 04:00:07 AM »

wickidwombat

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Re: Sigma 50mm f/1.4 DG HSM Art
« Reply #172 on: May 16, 2014, 04:03:12 AM »
sorry i meant this one
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Re: Sigma 50mm f/1.4 DG HSM Art
« Reply #173 on: May 16, 2014, 05:29:43 AM »
So on the fence about cancelling until issues and supplies are all worked out...But keep imagining this will be a great newborn lens...

Sure hope I'm not getting one of the lenses the OCD folk are tweaking to death and returning.  The stories here of lens churn are revolting.

Well said ...I think more than a few are over-tweaked!  8)
I am looking forward to Dustin Abbott's  review/comparison of both Sigma 50's...hope he got the Sigma Dock,too as I would like to hear what he has to say about that as well. His take is reliable, experienced, real-world and relevant. 
No measurbating.

Here you go, they are all shot within the same 30 minutes or so:

Aimed at the woman with the black umbrella (any Clutch fans here? lol)


Aimed for the blond woman's head.


Aimed at the signs with the balloons.


Refocused and tried again.


And again:


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YuengLinger

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Re: Sigma 50mm f/1.4 DG HSM Art
« Reply #174 on: May 16, 2014, 05:30:45 AM »
So on the fence about cancelling until issues and supplies are all worked out...But keep imagining this will be a great newborn lens...

Sure hope I'm not getting one of the lenses the OCD folk are tweaking to death and returning.  The stories here of lens churn are revolting.

Well said ...I think more than a few are over-tweaked!  8)
I am looking forward to Dustin Abbott's  review/comparison of both Sigma 50's...hope he got the Sigma Dock,too as I would like to hear what he has to say about that as well. His take is reliable, experienced, real-world and relevant. 
No measurbating.

Wow, really? You have NO idea how this lens is. It's pretty bold to say somebody is over tweaking and almost destroying a lens because I apperantly have OCD according to some here.

I will see if I didn't delete the images from my trip out and I'll wait for you tell me if that is nitpicking or a real problem.

I, for one, was responding more to the folks who mentioned sening back three or four of the 35mm's chasing perfection.  This 50mm is so new, plus, Viggo, you have decided to give Sigma a chance to fix.   

But really, just go to Amazon reviews or various forums (yes, including this one), and see how many loons are sending back several of ANY lens you can name, Canon, Sigma, whatever brand.  I'd bet not 1% of such folk ever got paid a penny for a photograph, yet they can't sleep at night because a lens is not living up to some impossible standard.

Working pros that I know (including a Pulitzer prize winner who is now a professor) would laugh at how WE obsess over things they never give a second thought to.

All that said, if I find that this lens is missing even 1 in 7 (much less the 40% we read about in one review) of shots in a well lit, decent contrast situation, back it goes--and then I'd wait for news from Simga that AF issues have been squarely addressed.  The fact that Viggo and others are willing to let Sigma fix the lens speaks clearly about how great the POTENTIAL of this lens is--which is why I haven't cancelled my order yet.

As for the USB mount, it might be creating more problems than it solves, despite Sigma's intentions.  It certainly feeds into the OCD behavior that many photographers have.  And you know what?  Most great photographers display a LOT of OCD behavior--at least according to their biographies.  Channeling that behavior into productive activities has been great for many fields of human endeavor!
« Last Edit: May 16, 2014, 06:28:06 AM by YuengLinger »

Viggo

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Re: Sigma 50mm f/1.4 DG HSM Art
« Reply #175 on: May 16, 2014, 05:35:15 AM »
And more of the same:

Aimed at the trashcan, focus suddenly behind.


Suddenly dead on:


Aimed athe lady's head, focus is behind again.


Dead on:


Aimed at the "551" dead on


Aimed at the blonde with the shopping bags


Dead on


Tell me again please about my OCD and that it's a non-issue?
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YuengLinger

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Re: Sigma 50mm f/1.4 DG HSM Art
« Reply #176 on: May 16, 2014, 05:41:34 AM »
No, Viggo, this is real world, practical use failure you are showing us--not pixel-peeping.

I'd have just sent it back and wait for Sigma to overhaul.  You are getting exactly the results any photographer would dread.

Thank you for taking the time to share these.

Viggo

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Re: Sigma 50mm f/1.4 DG HSM Art
« Reply #177 on: May 16, 2014, 05:45:32 AM »
No, Viggo, this is real world, practical use failure you are showing us--not pixel-peeping.

I'd have just sent it back and wait for Sigma to overhaul.  You are getting exactly the results any photographer would dread.

Thank you for taking the time to share these.

Appriciate that, and you were right earlier that I'm not trying to make Sigma look bad at all, and I WANT this lens to work, because the IQ is simply mindblowing. I didn't spend 1177 usd just to prove Sigma sucks. I really hope it can be worked out.
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Re: Sigma 50mm f/1.4 DG HSM Art
« Reply #177 on: May 16, 2014, 05:45:32 AM »

wickidwombat

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Re: Sigma 50mm f/1.4 DG HSM Art
« Reply #178 on: May 16, 2014, 06:59:29 AM »
I trust sigma will sort it out
I'd be interested to find out what specifically was wrong with your copy though

I doubt its software otherwise everyone would have these problems

and its not like your is off a little bit that shot aimed at the blonde with shopping back came so far forward it almost nailed the trash can!

my 85 was way off at first sent it in and it came back perfect and its been that way for a couple of years now
i've used it on 2x 5D mk2 bodies 2 x 5dmk3 bodies a 1Dmk3 a 600D and the EOS-M all bodies its fine no AFMA

my 35 was perfect out of the box thankfully

my 50 I knew AF was off in the store when i picked it up but I didnt have the option of another copy as the guy said its the first one in china as i requested :P

but as you can see the tweeking it needed was minor compared to yours and eldars and its performing well now

so heres hoping they give you a perfectly functioning lens and some good information to share with the rest of us on the problem I hope they do as it will help them alot from a PR perspective to be candid with an OCD community like CR :P
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Viggo

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Re: Sigma 50mm f/1.4 DG HSM Art
« Reply #179 on: May 16, 2014, 07:23:00 AM »
I trust sigma will sort it out
I'd be interested to find out what specifically was wrong with your copy though

I doubt its software otherwise everyone would have these problems

and its not like your is off a little bit that shot aimed at the blonde with shopping back came so far forward it almost nailed the trash can!

my 85 was way off at first sent it in and it came back perfect and its been that way for a couple of years now
i've used it on 2x 5D mk2 bodies 2 x 5dmk3 bodies a 1Dmk3 a 600D and the EOS-M all bodies its fine no AFMA

my 35 was perfect out of the box thankfully

my 50 I knew AF was off in the store when i picked it up but I didnt have the option of another copy as the guy said its the first one in china as i requested :P

but as you can see the tweeking it needed was minor compared to yours and eldars and its performing well now

so heres hoping they give you a perfectly functioning lens and some good information to share with the rest of us on the problem I hope they do as it will help them alot from a PR perspective to be candid with an OCD community like CR :P

I hope so too. I have calibrated 30+ lenses and this is the only one that needed more than one calibration and still doesn't work. I can accept AF misses for sure, I have them with all lenses, but all the other misses it's very clear it's my fault or if the dof is extremely thin and I aim up or down ad something small, we all know that can miss. But nothing like this.
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Re: Sigma 50mm f/1.4 DG HSM Art
« Reply #179 on: May 16, 2014, 07:23:00 AM »