Vray Render Problem - Circular Lines

[erspek]

I see the circular lines at the object and shadows when I render at big size. (6000x4000). How can I solve this problem?

 

If I use Mitchell-Netravali antialiasing filter with 1,333 blur then this circular lines are decreasing (or little bit disappearing). But I don't know it's true.

 

Here is the vray options:

 

Image Sampler

- Adaptive DMC

- Antialiasing filter Area Size: 1,5

 

Adaptive DMC image Sampler

- min subdivs=1

- max subdivs=4

- Crl tresh=0,001

 

Environtment

- GI Environment (on)

 

Color mapping

- default settings (no change)

 

Indirect illumination (on)

- Primary Bounces Irradiance map

- Secondary Bounces Brute Force

 

Irradiance map

- Current preset Medium

- Hsph. Subdivs=100

- Interp. samples=40

 

Brute Force

- Subsdivs=100

- Secondary Bounces=5

 

V-ray DMC Sampler

- Adaptive Amount=0,85

- Noise treshold=0,001

- Min Samples=8

 

Thank you,

Ersin