In this quick tip / tutorial we are going to take a look at the Vray physical Camera and its depth of field capabilities to create the macro effect you see in a real world macro lens
The VRay physical camera behaves just like a real world camera or a DSLR camera with only few differences and advantages as we are in the digital world , for example in an actual DSLR you can’t simply turn off the depth of field , you can only reduce it by adjusting the f stop . and if you increase the ISO you would get a lot of noise in a real DSLR but you won’t get any in our software , as well as the Vignetting effects.. etc .
So we have a lot of options here and we can do the impossible things with vray ( compared to the real world camera ) .
One of the things we can do is to take macro shots , sure we can do this in post ( like i did here ), but there is no match to the physical depth of field that VRay produces . Lets take a look at how we can do this .
Both in a real DSLR and the VRay physical camera , the depth of field depends on the f number . in addition to that , VRay only requires one more thing and it is “proper scale” . will get to the f number in a moment but make sure you always work with real world scale in Cinema 4D in order to get the best results in terms of lightning and camera settings .
Now let’s talk about the f number here . and as a general rule of thumb , keep in mind that higher numbers mean a smaller aperture and smaller numbers mean larger aperture , aperture size can effect both the exposure and depth field , the larger the opining ( small f numbers ) the more light passes into the sensor and vise versa . the larger f number ( smaller opining ) means less depth of field .
Take a look at these renders and see the differences between the them and how the f stop effects the depth of field ( click to enlarge )
Macro also isn’t just about the extreme depth of filed , its also about focal length of the lens , therefor high zoom lenses are used to isolate the subject for macro photography .
In conclusion, (1) make sure to use smaller numbers ( I recommend using the fixed exposure increments with the store exposure option in the physical camera tag ) and (2) make sure you are using real world scales for your scene .