Motion Blur adjustments

Hi!

I will make an animation with set the FPS of 3dsmax to 100 instead of 25 - so i will simulate a 4x slow motion when I play the 100FPS Sequence with 25 FPS. And for original speed i will play only every 4th frame.

So 25 FPS will be the original speed but i animate and render with 100 FPS.

What settings do i have to apply in VRayPhysicalCam (type: MovieCam), when i want to have the correct motion blur for 25 FPS (half frame blur duration), but animate and render with 100 FPS?

Thanks in advance!

moblur duration in vray obj settings.