Focus & Depth of Field
4 terms
Magnification Ratio
Focus & Depth of Field
ratio
The ratio between the size of a subject and the size of its image on the sensor.
m = image size / subject size
Manual Focus
Focus & Depth of Field
m
Focusing by turning the lens ring by hand while judging sharpness visually or by scale.
Microprism Collar
Focus & Depth of Field
A ring of tiny prisms around a focusing screen's centre that shimmers when the image is out of focus and clears when it is sharp.
Minimum Focus Distance
Focus & Depth of Field
m
The closest a subject can be to the sensor plane and still be brought into focus.