Lights and Lens

Dear Blog,

Here are the notes I have made during the first three weeks of the ‘Lights and Lens’ Practical Screencraft module.

I will start out with Focal Length.


Canon focal length comparison chart:

Full Frame Sensor

Wide – under 50mm (35mm, 24mm, 18mm, 14mm etc)

Standard – 50mm (Full Frame sensor)

Telephoto – above 50mm (85mm, 135mm, 200mm, 400mm etc)

APS-C Sensor

Sensor is 1.6x smaller than a full frame sensor.

Wide – under 35mm  (24mm, 18mm, 14mm etc)

Standard – 35mm

Telephot0 – Above 35mm  (85mm, 135mm, 200mm, 400mm etc)

Film Plane


film plane is the area inside any camera or image taking device with a lens and film or digital sensor. The film plane varies in distance from the lens focal point in each manufacturer. Thus each lens used has to be chosen carefully to assure that the image from the lens is focused on the exact place where the individual frame of film or digital sensor is positioned during exposure, the film plane is the location in which the lens creates the focused image which must be exactly upon the light-sensitive material. It is sometimes marked on a camera body with the ‘Φ’ symbol where the vertical bar represents the exact location.


The hyperfocal distance is the closest distance at which a lens can be focused while keeping objects at infinity acceptably sharp. When the lens is focused at this distance, all objects at distances from half of the hyperfocal distance out to infinity will be acceptably sharp.

Exposure and Depth of Field





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