Sigma 50mm f/1.4 DG HSM (Art) is finally here!

mzondeki wrote in post #16826351
So this is poor man's Otus

More like an Auto-focus version of the Otus.

draculr wrote in post #16826392
Okay I was annoyed at fstoppers for not allowing me to view full sized images. I found some though, you're all welcome

http://fstoppers.com …4/04/john-schell-4336.jpg

http://fstoppers.com …4/04/john-schell-5036.jpg

http://fstoppers.com …4/04/john-schell-5062.jpg

I'm a lot more impressed now looking at those. The microcontrast looks great.

The bokeh is nothing surprising. It's very much Sigma. No 50L/85L here imo, looks exactly like an exact mix between the Sigma 35 and 85.

Makes it much more of a choice really. You want the microcontrast and sharpness? Get the Sigma. You want the bokeh get the 50L.

Thank you! Yeah, these are quite good...doesn't look like full size, but they seem to show what the lens is capable of. So many of the shots on flickr and elsewhere are out of focus, in terrible light, etc.

If used prices on the 50L drop a bit, this could be a tough choice for me.

Invertalon wrote in post #16825740
Damn... If only Sigma can stop the crazy AF shift in artificial light. That was the ONLY flaw of the 35 art, but enough that it has put a sour enough taste in my mouth from trying another (I tried two), until I hear otherwise. And I have read a few recent reviews still talking about that issue on brand new 35's... So I guess it has not been fixed/solved yet.

Bummer... Because this 50 looks like it will be so good.

As far as I understand this is something Sigma can't possible fix - that would require a change in camera processing pipeline. My understanding is that it is normal for lenses to display a "spectral focus shift" - AF needs different MFA depending on the properties of the light (its spectrum). I was reading in a Canon camera review that these days cameras are smart enough to account for this effect, and make lenses focus more or less identically under different light. I strongly suspect (given how many - not just Sigma - aftermarket lenses seem to struggle with AF under fluorescent light conditions) than Canon disables or otherwise breaks this light correction feature when it detects non-Canon lenses.

Is anyone else a bit shocked at the size and weight? its about the same as the 24-70 2.8.

pulsar123 wrote in post #16826484
As far as I understand this is something Sigma can't possible fix - that would require a change in camera processing pipeline. My understanding is that it is normal for lenses to display a "spectral focus shift" - AF needs different MFA depending on the properties of the light (its spectrum). I was reading in a Canon camera review that these days cameras are smart enough to account for this effect, and make lenses focus more or less identically under different light. I strongly suspect (given how many - not just Sigma - aftermarket lenses seem to struggle with AF under fluorescent light conditions) than Canon disables or otherwise breaks this light correction feature when it detects non-Canon lenses.

FYI I've found that my 50L also focused differently indifferent lighting. So may not just be sigma. I basically always take a test shot now and then do a mfa for one area. Then redo as needed.

mgk2 wrote in post #16825560
RIP 50L....

mgk2 wrote in post #16825586
This is an Otus killer, which is smaller, lighter and has AF.

None of the current 50mm can come close....don't even compare this to anything Canikon.

mgk2 wrote in post #16825674
Huh? You scared? Or your 50L has just dropped 40% of its resale value?

Of course it's a competition. They are all in to make profit.

Quoted to hopefully highlight for you how ridiculous you're coming off as...

mgk2 wrote in post #16826163
Overall? More like 100x

So, it'll make the worst amateur a pro. Hmmm, never thot equipment could do that. Oh well, live and learn. I think I'll pass tho, I prefer amateur status.

pulsar123 wrote in post #16826484
As far as I understand this is something Sigma can't possible fix - that would require a change in camera processing pipeline. My understanding is that it is normal for lenses to display a "spectral focus shift" - AF needs different MFA depending on the properties of the light (its spectrum). I was reading in a Canon camera review that these days cameras are smart enough to account for this effect, and make lenses focus more or less identically under different light. I strongly suspect (given how many - not just Sigma - aftermarket lenses seem to struggle with AF under fluorescent light conditions) than Canon disables or otherwise breaks this light correction feature when it detects non-Canon lenses.

It's also about the camera too. Some cameras have built in spectral adjustment algorithms so that when you shoot a purely red rose, it still maintain sharp focus. (Different light spectrums have different focal points.) Older cameras do not have these algorithms. So with a third party lens or an older canon lens, the question is can these lens interpret the cameras instructions correctly? Also newer canon lens appears to have more advanced electronics that can communicate better with newer camera bodies ( closed loop system). Then like the 50L, the designed spherical aberrations throws off the focus when one stops down the aperture. There are many reasons for misfocus, most are a combination of factors and the camera to lens pairing is also a key factor.

Was going to get the 50L but opted for this instead, it's cheaper and should be nicer too.

pulsar123 wrote in post #16826484
As far as I understand this is something Sigma can't possible fix - that would require a change in camera processing pipeline. My understanding is that it is normal for lenses to display a "spectral focus shift" - AF needs different MFA depending on the properties of the light (its spectrum). I was reading in a Canon camera review that these days cameras are smart enough to account for this effect, and make lenses focus more or less identically under different light. I strongly suspect (given how many - not just Sigma - aftermarket lenses seem to struggle with AF under fluorescent light conditions) than Canon disables or otherwise breaks this light correction feature when it detects non-Canon lenses.

If that is true, then Canon plays dirty D:

vienhuynh wrote in post #16826688
If that is true, then Canon plays dirty D:

And then it wouldn't be the first time they are caught doing that. I couldn't believe when I read that some semi-pro film Canon cameras from old days would intentionally "scramble" exposure metering with MF (non-Canon) lenses - and not by a predictable, but rather by a random (and large) factor (so some shots were say at -2EV, others at -1EV etc.).

snake0ape wrote in post #16826635
It's also about the camera too. Some cameras have built in spectral adjustment algorithms so that when you shoot a purely red rose, it still maintain sharp focus. (Different light spectrums have different focal points.) Older cameras do not have these algorithms. So with a third party lens or an older canon lens, the question is can these lens interpret the cameras instructions correctly? Also newer canon lens appears to have more advanced electronics that can communicate better with newer camera bodies ( closed loop system). Then like the 50L, the designed spherical aberrations throws off the focus when one stops down the aperture. There are many reasons for misfocus, most are a combination of factors and the camera to lens pairing is also a key factor.

This may be true for some cameras, but for my particular camera (50D) I always see a marked difference in the light spectrum AF sensitivity, when comparing Canon with non-Canon lenses. Canon's couple of 50mm f1.8, 135L, 70-200L I had/have all behave well under fluorescent light; my former Tamron 17-50 and current Sigma 17-50 are not as lucky (especially the Tamron).

snake0ape wrote in post #16826635
It's also about the camera too. Some cameras have built in spectral adjustment algorithms so that when you shoot a purely red rose, it still maintain sharp focus. (Different light spectrums have different focal points.) Older cameras do not have these algorithms. So with a third party lens or an older canon lens, the question is can these lens interpret the cameras instructions correctly? Also newer canon lens appears to have more advanced electronics that can communicate better with newer camera bodies ( closed loop system). Then like the 50L, the designed spherical aberrations throws off the focus when one stops down the aperture. There are many reasons for misfocus, most are a combination of factors and the camera to lens pairing is also a key factor.

The USB Dock now gives the ability to update the firmware should overcome this problem.

Very impressive samples. The bokeh quality in particular is sterling. I wish I liked this focal length more.

WhyFi wrote in post #16826251
edit II: ah, I see that that link was posted on the previous page in this thread, too. In any event, I think that some of the motorcycle/automotive shots are pretty impressive.

Does the image of the lock @ f1.4 look a bit soft compared to the f2 to you as well?