Sigma 24-70 2.8 OS Art Initial Impressions

Uhm... are you sure you didn't get a pre-production unit ?

Your other findings were expected based on the official data here:

https://www.sigma-global.com …duct/art/a_24_7​0_28/data/

The "low corner resolution" is most probably field curvature. Yes, there is lot of it wide open, and apart from brick walls, it can be a problem for landscapes. However, seems that stopping down helps corners a lot... at the cost of exposure time or noise.

Distortion is around +/- 3%, which is disappointing but can (must) be fixed in post at the cost of possibly 1mm at the wide end (similar problem with Canon 24-105).

Vignetting is also heavy and far from state of the art (Art ? ).

Seems to me that Sigma is taking advantage of the Art lineup to squeeze-in some subpar designs.
And in your specific case, you probably got a lemon-squeeze

So GLAD I went with the L

Talley thanks for posting

I stand by my thoughts with Sigma

They are too close on the primes NOT to consider an Art over the L

For a zoom...NOTHING is going to touch a Canon or a Nikon Variable L lens

Zooms with Canon and nikon

Primes are a good choice with the Sigma arts

Too bad...I was hoping for some more competition from Sigma on the zooms

Oh hush guys. Not garbage. But the OS is questionable. The center sharpness matches the art primes at same f stop so it's really outstanding. The corners suck but that's to my standards and I'm a prime guy anyway.

We need the reviewers to get ahold of it really like lens rentals on the iq side.

af is fast. This new hsm on the 85/135 and now 24-70 is fast. This may or may not be same af speed as the mk2 but it's fast. As fast as the 200/2 if not faster.

CheshireCat wrote in post #18397641
Uhm... are you sure you didn't get a pre-production unit ?

Your other findings were expected based on the official data here:

https://www.sigma-global.com …duct/art/a_24_7​0_28/data/

The "low corner resolution" is most probably field curvature. Yes, there is lot of it wide open, and apart from brick walls, it can be a problem for landscapes. However, seems that stopping down helps corners a lot... at the cost of exposure time or noise.

Distortion is around +/- 3%, which is disappointing but can (must) be fixed in post at the cost of possibly 1mm at the wide end (similar problem with Canon 24-105).

Vignetting is also heavy and far from state of the art (Art ? ).

Seems to me that Sigma is taking advantage of the Art lineup to squeeze-in some subpar designs.
And in your specific case, you probably got a lemon-squeeze

imo it's rather pointless to buy a 2.8 zoom only to stop down to be able to get sharp corners/anything. You might as well be getting the 24-105A and stick with that.

I for one am glad that Talley took the time to share his first impressions. I wasn't going to buy the 24-70 anytime soon, but it's a good warning to rush into anything.

Apricane wrote in post #18400808
imo it's rather pointless to buy a 2.8 zoom only to stop down to be able to get sharp corners/anything. You might as well be getting the 24-105A and stick with that.

I for one am glad that Talley took the time to share his first impressions. I wasn't going to buy the 24-70 anytime soon, but it's a good warning to rush into anything.

Thanks. Overall I think the lens performs great. It's just the tips of the corners that kinda eh.. to my taste suck but the rest is very good to excellent. The OS I think is indeed working fine I was able to adjust my grip on it and getting 80% keepers at 1/5 70mm.

It's a subtle difference for video and unfortunately I wanted the lens for video and I know the VC on the Tamron works better so I'll be looking into the G2.

AF is fast though... really fast.

Apricane wrote in post #18400808
imo it's rather pointless to buy a 2.8 zoom only to stop down to be able to get sharp corners/anything.

Well, we are only talking about the corners here.
Personally, I only need sharp corners for landscape shots.
For environmental portraits, I even like outward field curvature. So that bug might be a feature

Would like to see samples in the field. I am mostly worried about color rendering quality.

Apricane wrote in post #18400808
imo it's rather pointless to buy a 2.8 zoom only to stop down to be able to get sharp corners/anything. You might as well be getting the 24-105A and stick with that.

I for one am glad that Talley took the time to share his first impressions. I wasn't going to buy the 24-70 anytime soon, but it's a good warning to rush into anything.

aside from astro, i can't really think of many instances where you'd need everything sharp, including the corners at f2.8...so i'm kinda the opposite...i don't see the point in sharp corners with faster lenses...most of the time you aren't framing your subject in the corners, so it'll be blurred regardless

but if you're shooting landscapes, and it's not sharp in the corner stopped down, then that matters a little more...but i don't know, maybe i'm missing some situation where f2.8 and sharp corners are needed.

Just received this lens from Lens Rental, This is the best 24-70 2.8 that Have ever owned. VC or IS work's perfect. Just sold the Tamron 24-70 2.8 VC had the Canon 24-70 2.8 v1 a few years back. These are some JPEG no processing no sharpening.

cseybert wrote in post #18401458
Just received this lens from Lens Rental, This is the best 24-70 2.8 that Have ever owned. VC or IS work's perfect. Just sold the Tamron 24-70 2.8 VC had the Canon 24-70 2.8 v1 a few years back. These are some JPEG no processing no sharpening.

Hosted photo: posted by cseybert in
./showthread.php?p=184​01458&i=i140165366
forum: Canon Lenses

Hosted photo: posted by cseybert in
./showthread.php?p=184​01458&i=i126432411
forum: Canon Lenses

I'm confused. The photo says Canon EF 24-70mm f/2.8L II USM and it doesn't have IS, but you said the VC or IS works perfect. Also, this thread is about Sigma 24-70 2.8 OS Art

2loose wrote in post #18401507
I'm confused. The photo says Canon EF 24-70mm f/2.8L II USM and it doesn't have IS, but you said the VC or IS works perfect. Also, this thread is about Sigma 24-70 2.8 OS Art

It's the forum software. My sample was the same.

Talley wrote in post #18401510
It's the forum software. My sample was the same.

Ahh I see, ok then

yay a dog photo lol

Yes I know these are from Sigma 24-70 2.8 art. Must be the forum software.

So.....

How does it compare to Canon EF 24-70mm 2.8 II?

AF, sharpness, etc.

I have not used the mark ll version. Owned the Canon 24-70 2.8 v1