For a theoretical “thin lens” (=of virtual length 0) , it’s clear where this plane is. For the exact location in a real world lens, see below.

Directional lightingphotography

Just tilting the camera of course is not enough, to get a focussed image. The Gaussian focus equation also must be satisfied. The Gauss equation is however equivalent to the second Scheimpflug priciple.

For a mind game lets keep the sensor plane and the object plane fixed and non-parallel. This defines a shared common line in 3D space. Through each line in Space there is an infinite number of Planes, containing it. Obviously not all can be the plane of best focus. Say:

Key Light: The main source of light in a photograph that establishes the overall look and feel of the image, often creating shadows and highlights.

Directional lightingexamples

Directional light refers to light that comes from a specific direction, creating strong shadows and highlights. This type of lighting helps define shapes and textures in a photograph, emphasizing depth and dimension. It contrasts with diffuse light, which scatters in many directions and softens shadows, allowing for a more even illumination of subjects.

Available Light: Any light source that is present in a scene without the use of additional artificial lights, often relying on natural or ambient lighting.

Diffusedlight photography Examples

Normally, the focus plane is 90 degree to the optical axis. This is due to symmetry reasons. A problem arises when two objects have so different distances, that they can not be focussed at the same time.

Usage: First place the object center (the green dot, the spot where the optical axis meets the object) at a local you like , for example at 60 on the x-axis. Them move the lens (the other green dot) to a location where it’s possible to place the camera-lens position. The interactive graphic keeps the optical axis in the center of the lens and maps the edges of the sensor to the wanted object plane. The magnification if measured perpendicular(!) to the optical axis. Keep in mind, that on your monitor you’ll see a trapezoid / trapezium)

In general the lens is tilted, but the image not focussed. However, as soon as wwe use the lens focus mechanism, the first Scheimpflug principle is not satisfied any more, we would have to tilt the lens a little to satisfy the first criterion, but then the image is not focussed any more, etc.

Natural Light: Light that comes from the sun or moon, which can change throughout the day, creating various moods and effects in photography.