how to get right dimensions of hdri with vrayhdri on backgro

[pengo]

how to reduce the hdri image dimensions when I use it for background (environment standard background) with vrayhdri???

how do u use it?

I have this problem the image hdri used with vrayhdri in standard environment background of max is too big respect the scene objects!!!

could u suggest something

I use 3dsmax5
thanks in advance
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a stupid man that want to know