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Vignetting amount – Specify the amount of the vignetting effect, where 0.0 is no vignetting and 1.0 is normal vignetting.

 

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Aperture F-number vs Shutter Speed vs ISO
Cheat Sheet

The main options that control the brightness of a V-Ray Physically Accurate camera are Aperture F-number, Shutter Speed and ISO. They affect each other and you need to balance them according to your scene. Keep in mind that these settings do not correspond to those of a real-life camera. They apply only to the V-Ray Physically Accurate camera.

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  • F-number determines the size of the opening in the camera lens. What the number refers to is the ratio between the aperture's focal length and the actual diameter of the aperture. A smaller F-number means a larger aperture. The larger the Aperture, the brighter the scene becomes but that also introduces more Depth of field.

  • Shutter Speed determines how long the lens stays open when taking the photo. The numbers refer to fractions of a second. The slower the Shutter Speed, the brighter the scene becomes but that also introduces Motion Blur.

  • ISO determines the camera's sensitivity to light in the scene. Lowering the ISO means that more light is needed to achieve good lighting. Increasing the ISO means that less light is needed to achieve good lighting. A day scene, lit with a V-Ray Sun, for instance, looks best when captured with around 100 ISO.

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Example: Depth of Field (DOF)

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Example: Exposure Control | F-Stop (f-number)

 

Lowering the F-Number value will actually make the image brighter. The camera aperture is more open, so more light is absorbed.

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Note: The Sponza Atrium model was created by Marko Dabrovic ( http://www.rna.hr/) and Dabrovic and was one of the models for the CGTechniques Radiosity competition.

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