Camera

Sensor type: Defines the width of the camera sensor, using a Custom value, or common sensor types.
With the lens focal length, the sensor size defines the field of view of the image. The larger the sensor, the wider the field of view.

This also affects the size of the circle of confusion, which defines the amount of out-of-focus blur, also called bokeh.
Mobile phones have smaller sensors, which creates a wider depth of field and less out-of-focus blur.
Professional cameras tend to have much larger sensors, like Fullframe (24*36 mm) or Medium Format (6*6 cm or larger), and creates a lot more bokeh.

The Presets button (top right of the panel) allows you to pick a Sensor size from several common Camera models.
You can also create your own presets by clicking on the + button at the bottom of the Presets list.

In the Preferences, you can choose the default Sensor Type that should be used for new cameras created using the Photographer panels.

Clip Start: Camera won't render pixels with a depth value lower than the Clip Start.
Clip End: Camera won't render pixels with a depth value higher than the Clip End.

These Clip values are useful for real-time viewport rendering and EEVEE, as a way to maximize Z-Depth precision and avoid artifacts when surfaces are really close to each other, called Z-Fighting.
When such artifacts appear, reduce the distance between the 2 clip values, while making sure that your scene foreground and background are still visible.
A pathtracer like Cycles won't have Z-Depth artifacts and the distance between the two Clip values doesn't matter much.


Passepartout: Transparence of the out-of-frame, to help composing your shot. It is highly recommended to use a value of 1 when using Realtime Viewport Compositing and the Camera Lens FX, as it will affect the calculation of some nodes that are using the render size in their calculations.
In the Preferences, you can choose the default Passpartout settings that should be used for new cameras created using the Photographer panels.

Flip Camera:  Quickly Flip camera horizontally or vertically, to try your composition from a fresh angle.

World Override: Overrides World for this camera. This allows you to assign different worlds for different cameras.

Frame Override: Overrides Frame Range for this camera. This allows you to render different parts of animation using different cameras.

Samples Override: Overrides Render Samples and Noise Threshold per camera.
Important:  Cycles adaptive sampling is calculated  using the pixel information pre-exposure.  This means that Cameras with different exposures will require different Noise Threshold values to achieve the same level of noisiness.

Note: If you decide to enable the override for one of your cameras, it is recommended to use a Main Camera that will define the fallback settings if Overrides are not enabled.
Alternatively, consider enabling overrides for all the other cameras in your scene, or they will simply use the last settings that were applied.