Epic-W: Sigma 18-35 1.8 vs Zeiss Ze 15mm 2.8

[Ksawery Jan Oroczko]

Using the Sigma 18-35 1.8 and Zeiss Ze 15mm with Epic-W (IPP2) for on location check for a upcoming project, I discovered some nasty light smears on the Sigma – A bit disappointing compared to the Zeiss Ze, which had none of it. I will update the test next with the Cooke S4i 18mm T2.0, which we will use for the final shooting.


Sigma
https://dl.dropboxusercontent.com/u/481841/A692_C034_0204H0.0000000F.0000000.jpg
R3D
https://dl.dropboxusercontent.com/u/481841/Sigma.zip


Zeiss
https://dl.dropboxusercontent.com/u/481841/A692_C036_02040J.0000000F.0000000.jpg
R3D
https://dl.dropboxusercontent.com/u/481841/Zeiss Ze.zip




______________________________________________
Motionary – Film- & Video Production Zuerich, Switzerland
RED Epic-W, RED Epic-X and a ton of grip.
www.motionary.ch

 

[Josiah Duncan]

Could this have to do with the Zeiss having a permanent lens hood attached getting rid of any sort of flare? I have the zeiss and it's a great lens, but can't test it next to the sigma.

 

[Ksawery Jan Oroczko]

nope, I think its a weakness of the Sigma, in that particularly case. The Zeiss "lens hood" is nearly is more a decoration

 

[Audy Erel]

It looks like to me as if someone have touched and leave a nasty fingerprints oil on the back of the Sigma lens...

 

[Ksawery Jan Oroczko]

The lens was clean

 

[Dan Kanes]

Interesting!

What T Stop on the Sigma?

Funny enough I see a different form of diffusion feel on the 15mm ZE - looks more like spherical aberration (not CA), but would agree the sigma streak feel appears to be more of a polishing, finger grease, or moisture in the lens type of scenario.

Wondering if the sigma was at 1.8 or 2.8

 

[Ksawery Jan Oroczko]

F stop on both was 4.

 

[Tommaso Alvisi]

Sigma does that till around 2.8 unfortunately, I wrote about it on the Contax thread a while ago...built in DoubleFog!

 

[Mark K.]

The Zeiss 15mm is also an exceptional lens, so most wide angles are going to perform a little underwhelmingly by comparison.

 

[Dan Kanes]

Personally never had this issue on my sigmas!

Will be checking again this week to make sure I'm not smoking anything.

Especially at an f4