Sigma 70-200 2.8ex CA & PF is this normal?

[tekgik]

Hi guys,

Is chromatic abberations & purple fringing really evident on this lens? Im getting dissapointed considering its popularity and ofcorse the price! i thought APO will reduce it?

you can see the photos here: http://www.pbase.com/tekgik/test

should i return it?


thank you very much!

[vvizard]

I was pretty shocked by your pictures :/ I'm considering this lens myself. It'll either be this or the 70-200mm f/4L. I hadn't seen any review mentioning this. I would have mailed the pics to Sigma to see what they think.

BTW: Thanks for great shots of the lens itself. Really nice to see it's physical size against the 50mm.

[boobops]

No that's not normal. I have to try really hard to see any CA at all.

Steve

[boobops]

Just to go somewhat further.

To my knowledge CA does NOT improve when stopping down.

Out of interest are the shots on your site at 100%?

Is there a filter on the lens?

Was the camera on a tripod?

What did you use to process the RAW file - assuming it's RAW?

Have you tried the lens on another body?

Steve

[DaveG]

tekgik wrote:
Hi guys,

Is chromatic abberations & purple fringing really evident on this lens? Im getting dissapointed considering its popularity and ofcorse the price! i thought APO will reduce it?

you can see the photos here: http://www.pbase.com/tekgik/test

should i return it?


thank you very much!

Almost all of your images look like they have problems. I wonder if there could be something on the CMOS? I'm no Sigma fan but that lens is a lot better than this.

[tekgik]

boobops,


base on my test stopping down reduced ca's specially f5 up! you can see it on my test gallery

yes 100% crops

no lens filter.

no tripod.

its jpeg

havent tried in another body yet.

it seems that it is a problem with a 10d body too? read this post http://forums.dpreview.com/forums/read.asp?forum=1029&message=6746173 read the message of jbjones (attached images w/ ca)

[tekgik]

DaveG wrote:
tekgik wrote:
Hi guys,

Is chromatic abberations & purple fringing really evident on this lens? Im getting dissapointed considering its popularity and ofcorse the price! i thought APO will reduce it?

you can see the photos here: http://www.pbase.com/tekgik/test

should i return it?


thank you very much!

Almost all of your images look like they have problems. I wonder if there could be something on the CMOS? I'm no Sigma fan but that lens is a lot better than this.


DaveG,

thats what i suspect that my DR is the prob. But how come that my kit lens and 50mm 1.8 have none of this? I guess telephoto lens are prone to this? I tetruned my lens already and waiting for their evaluations till friday. I hope it would be ok by then!

i really want to like this lens! Here's some of my shots with this lens! http://www.pbase.com/tekgik/motorsportsfest