Problem with Sigma 24-70

I've recently got the Sigma 24-70mm and I noticed a problem with the lens. To me it seems there's a cloud like smoke in the lens. I've compared it with my 50mm and it looks more sharper than the sigma. Do you guys think this is normal or if it's a problem I should send it to sigma. Also, can you give me a more specific way of tell Sigma the problem.

Thanks

Here's some pictures of it. The first two pictures were at 50mm, 1/15,f/4

Canon 50mm

Is this with or without the hood. It is prone to light spill and flare without the hood pretty easily.

elysium wrote in post #5506475
Is this with or without the hood. It is prone to light spill and flare without the hood pretty easily.

Those are with the hood.

Hmm thats interesting, have you tried some tests outside with more sun to see how it copes. I can see the lack of saturation on the can pic.

Ive never really had this problem with mine so only other suggestion would be a not so great copy? Suppose best to wait for others to chime in.

Here's two more pictures I took last night. One was with my kit lens and the other with the Sigma 24-70. Both were taken at 24mm, 1/30, f/4

Canon 18-55

Have you checked that the front and rear lens elements are clean?

Got a filter on that 24-70?
If so, take it off and try again.

michaelgreen78 wrote in post #5507046
Have you checked that the front and rear lens elements are clean?

I've done that with the first two pictures I've taken. And I still have that problem.

xarqi wrote in post #5507335
Got a filter on that 24-70?
If so, take it off and try again.

Yeah I have the Hoya pro 1 filter.

I try to take some pictures with and without pictures today.

Here's some shots I took today. All shots were taken at 24mm, iso 100, 1/20, f/8. All were taken with tripod.

Sigma 24-70mm With filter

Do you guys think it's the lens? Is it a good idea to send it to sigma?

Wow that doesn't look good. Give it a good, through cleaning on both sides, and if the problem is still there, send it back.

perryge wrote in post #5520208
Wow that doesn't look good. Give it a good, through cleaning on both sides, and if the problem is still there, send it back.

The shot outdoors were cleaned before I considered taking the pictures.

What kind of problem is it because when I send it to sigma, how am I gonna explain the problem.

thats odd... i have a siggy 24-70 also and i tested it with my canon 50mm a while back and my shots came out almost identical.

nothing like how yours is... weirdness

I'm out of ideas. If it isn't a grubby element surface, or a nasty filter, I'm thinking it has to be an internal problem - gross fungal growth, an element out of alignment after a drop, or a flaw in construction. Send it off to Sigma with a CDROM of example images, or just include a note with the URL of this thread. I'd call it "overall contrast loss and poor resolution akin to veiling flare", but "I've got a cloud in my lens!" should work too.