Sigma 50mm Art 1.4 Focusing problems

[aznable]

got my 50 Art two days ago...perfect with 50D a a pronunced FF with 1dmk3....solution....fine tune with the dock, now the focus is good with 1dmk3 and with in body regulation with 50D, now i get good results with both bodies

Yes, so was Eldar's and mine also, shoot another 4000 images in and out and see if it changes .

4k? too much

the focus is consistent tough

I have three batteries, just run through three batteries and you have shot 4000 images. Do half and you still be able to see the drift is there..

i will try with focal, but the beaviour of the lens seems normal with autofocus system of 1D series....also in lenstip.com review the lens was has pronunced FF with 1d series + inconsistency

dwhich kind of problems had with your 50 Art?

 

[Viggo]

got my 50 Art two days ago...perfect with 50D a a pronunced FF with 1dmk3....solution....fine tune with the dock, now the focus is good with 1dmk3 and with in body regulation with 50D, now i get good results with both bodies

Yes, so was Eldar's and mine also, shoot another 4000 images in and out and see if it changes .

4k? too much

the focus is consistent tough

I have three batteries, just run through three batteries and you have shot 4000 images. Do half and you still be able to see the drift is there..

i will try with focal, but the beaviour of the lens seems normal with autofocus system of 1D series....also in lenstip.com review the lens was has pronunced FF with 1d series + inconsistency

dwhich kind of problems had with your 50 Art?

Adjusted with FoCal and plotted the numbers into the lens via the docking. It was flawless, absolutely spot on, FoCal showed 99,4% consistency with 30 shots, or better/same as the 24-70 and 200 f2. I loved it. But after a week it started to miss, a little or very badly, like 10 meters from subject. And it could be 5 metes behind, spot on and ten meters in front within three consecutive shots. Calibrated and adjusted new values, worked perfect again, for a while. And eventually I did t have more afma range to go to and it was all over, completely unstable and random.

 

[aznable]

got my 50 Art two days ago...perfect with 50D a a pronunced FF with 1dmk3....solution....fine tune with the dock, now the focus is good with 1dmk3 and with in body regulation with 50D, now i get good results with both bodies

Yes, so was Eldar's and mine also, shoot another 4000 images in and out and see if it changes .

4k? too much

the focus is consistent tough

I have three batteries, just run through three batteries and you have shot 4000 images. Do half and you still be able to see the drift is there..

i will try with focal, but the beaviour of the lens seems normal with autofocus system of 1D series....also in lenstip.com review the lens was has pronunced FF with 1d series + inconsistency

dwhich kind of problems had with your 50 Art?

Adjusted with FoCal and plotted the numbers into the lens via the docking. It was flawless, absolutely spot on, FoCal showed 99,4% consistency with 30 shots, or better/same as the 24-70 and 200 f2. I loved it. But after a week it started to miss, a little or very badly, like 10 meters from subject. And it could be 5 metes behind, spot on and ten meters in front within three consecutive shots. Calibrated and adjusted new values, worked perfect again, for a while. And eventually I did t have more afma range to go to and it was all over, completely unstable and random.

seems a very bad problem...i will take more shots, for now i taken just 2 hundreds

 

[wickidwombat]

4 copies? Ouch, more of the same experience I have, and mine is awaiting a new motherboard.

Mine was between +11 and +17 and the different distances , but then one day I also had to add +12 in camera to get anything focused right. So all I can say is +1 to your experience, mine was the exact same way.

I will update in the ongoing thread about the 50 Art when I get it back.
But this does not give me very high hopes...

Definitely something wrong with the first batch.
But after all those years I think Sigma should be very careful especially with the first shipments of their product, to keep the brand high !
As it's not easy to recover the brand.

I think the issue is much more serious than a first batch problem, myself an others had the same issues with the 35 Art as well. All I can say is that if my 50 Art doesn't work after repair, I'm sooo done with Sigma ..

In my case I got 35 Art from the first batch.
And zero … yes ZERO problems !!!

Ditto mine is amazing and probably the fastest most accurately focusing lens in low light that I own and have ever used

 

[IsaacImage]

te]
Ditto mine is amazing and probably the fastest most accurately focusing lens in low light that I own and have ever used
[/quote]

What body you are using it with ?
Most of the troubles with the newest 1dx or 5d mkiii's AF system

 

[wickidwombat]

te]
Ditto mine is amazing and probably the fastest most accurately focusing lens in low light that I own and have ever used

What body you are using it with ?
Most of the troubles with the newest 1dx or 5d mkiii's AF system
[/quote]
5d3 and eos m

 

[IsaacImage]

Small update from my side.
I'm on fifth copy.
+13 AF adjustments needed and far left and far right AF points are missing on 1dx.
Sounds like normal d800 problem spoke to a Sigma rep. During the photo video expo today he told me to bring it to a service they definitely can adjust it..... Let's see how it goes.

 

[wickidwombat]

Small update from my side.
I'm on fifth copy.
+13 AF adjustments needed and far left and far right AF points are missing on 1dx.
Sounds like normal d800 problem spoke to a Sigma rep. During the photo video expo today he told me to bring it to a service they definitely can adjust it..... Let's see how it goes.

Have you got the sigma dock? I just adjusted my 50 using the dock

 

[IsaacImage]

The USB Dock are not going to help as there is no any new firmware available yet.
The regular adjustments you can do in camera body.
And more complicated staff like adjustments per AF points you can not do with the dock anyway.
And I still believe that new lens should be adjusted and calibrated at the factory.
Maybe I'm an old school guy

 

[kaihp]

The USB Dock are not going to help as there is no any new firmware available yet.
The regular adjustments you can do in camera body.
And more complicated staff like adjustments per AF points you can not do with the dock anyway.
And I still believe that new lens should be adjusted and calibrated at the factory.
Maybe I'm an old school guy

The dock can do adjustments at four different subject distances. You cannot do that with the in-body AFMA.

So in this case, yes, you are a bit old-school. Nothing wrong with that, though - I like to shoot in M over Tv and Av modes, for example ;D

 

[wickidwombat]

Yeah the do k allows you to adjust the lens properly to a degree that Afma in body simple cannot achieve

 

[NancyP]

50 Art users with focus problems - have you contacted Sigma? Has anyone thought to mention the issue to Roger Cicala, owner and geek extraordinaire of Lens Rental? He gets large numbers of lenses and is one of the few in the position to evaluate copy variation, durability, mechanical quirks. His review of the Sigma 50 Art was based on just a couple of lenses, but if enough people are interested, he might stock and test a bunch of the 50 Arts.

 

[IsaacImage]

50 Art users with focus problems - have you contacted Sigma? Has anyone thought to mention the issue to Roger Cicala, owner and geek extraordinaire of Lens Rental? He gets large numbers of lenses and is one of the few in the position to evaluate copy variation, durability, mechanical quirks. His review of the Sigma 50 Art was based on just a couple of lenses, but if enough people are interested, he might stock and test a bunch of the 50 Arts.

Absolutely agree Nancy
Lots of respect to Roger.
We need to drop him a line

 

[Viggo]

Small update from my side.
I'm on fifth copy.
+13 AF adjustments needed and far left and far right AF points are missing on 1dx.
Sounds like normal d800 problem spoke to a Sigma rep. During the photo video expo today he told me to bring it to a service they definitely can adjust it..... Let's see how it goes.

Exactly the same with mine, +11-17 and far points absolutely doesn't work. Anyone know if the 50 Art can't utilize the cross type far right and left and simply uses cross type in the center instead of double cross type?

 

[candyman]

Small update from my side.
I'm on fifth copy.
+13 AF adjustments needed and far left and far right AF points are missing on 1dx.
Sounds like normal d800 problem spoke to a Sigma rep. During the photo video expo today he told me to bring it to a service they definitely can adjust it..... Let's see how it goes.

Exactly the same with mine, +11-17 and far points absolutely doesn't work. Anyone know if the 50 Art can't utilize the cross type far right and left and simply uses cross type in the center instead of double cross type?

Viggo, I will do some checking with my 5D MKIII. You know, I am just an amateur and not having to much time working a lot and dealing with 2 young kids. Today is some nice weather so I will see what I can do.

 

[YuengLinger]

Viggo wrote:

"Exactly the same with mine, +11-17 and far points absolutely doesn't work. Anyone know if the 50 Art can't utilize the cross type far right and left and simply uses cross type in the center instead of double cross type?"

This might be the best question in this thread!

 

[IsaacImage]

Viggo wrote:

"Exactly the same with mine, +11-17 and far points absolutely doesn't work. Anyone know if the 50 Art can't utilize the cross type far right and left and simply uses cross type in the center instead of double cross type?"

This might be the best question in this thread!

100%

 

[candyman]

Ok, it turns out I did not have so much time today but here is an example. Please, help me to better understand your quest so I can share with you the results of my copy of lens

 

[IsaacImage]

Ok, it turns out I did not have so much time today but here is an example. Please, help me to better understand your quest so I can share with you the results of my copy of lens

It's a bit hard to judge by such a small files but looks sharp to me.

 

[cid]

And I thought it will be my fast prime in my set

sadly there is no way I'm buying lens which has AF focus inconsistency, i they don't solve it, I'll rather give 35A a shot, or wait for 50L II