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title: "V-Ray Exposure Value, Film Sensitivity and F-Number"
canonical: "https://documentation.chaos.com/space/VRHINO/116130357/V-Ray%20Exposure%20Value%2C%20Film%20Sensitivity%20and%20F-Number"
format: markdown
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This page provides information about the V-Ray Exposure Value, V-Ray Film Sensitivity and V-Ray F-Number nodes in Grasshopper.


## **Overview**

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The Exposure Value node calculates exposure based on ISO, F-Number and Shutter Speed inputs. The F-Number node c<span style="color: #172b4d">alculates a F-number value for a given Defocus value. The Film Sensitivity node calculates an ISO value based on EV, F-Number and Shutter Speed inputs.</span>

<span style="color: #172b4d">These three components work together with the V-Ray Camera component.</span>



## **V-Ray Exposure Value**

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## **V-Ray Film Sensitivity**

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## **F-Number**

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### **Examples**

Exposure Value component calculates EV based on the base camera parameters:


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ISO component calculates the ISO based on the other base camera parameters and EV. The ISO component represents an easier way to adjust the camera ISO in order to match a given EV value:


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The F-number component determines the calculations of the ISO and F-Number based on the defocus amount and the rest of the base camera parameters.

The F-number from Defocus is the easiest way to set up the desired Depth of Field without the need of additional calculations: