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Filmmaking Dictionary: Number 1 / 1:1 Reproduction (1× Macro)
Definition
1:1 reproduction, also written 1× magnification, means that the optical image formed on the sensor or film is the same physical size as the subject. A 10 mm-wide object forms an approximately 10 mm-wide image at the recording plane.
It does not mean that the object appears life-size on a monitor. Display size, viewing magnification and cropping can make the recorded object look much larger without changing the lens’s reproduction ratio.
Reproduction Ratio Versus Frame Coverage
At 1:1, a 20 mm-wide subject occupies 20 mm of sensor width. It therefore fills more of a smaller sensor than a larger one. The optical magnification can remain the same even though the recorded framing looks tighter on the smaller format.
This distinction matters when planning an insert of a ring, a watch mechanism or small lettering. Establish both the physical subject size and the active recording area. ‘Macro lens’ alone does not tell you whether the detail will fill the intended frame.
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Working Distance Is a Separate Measurement
Working distance describes the clearance between the front of the lens or its housing and the subject. Focus distance is normally referenced to the camera’s image plane. Neither number should be substituted for the other when planning room for lights, reflectors or moving objects.
Two lenses can both reach 1:1 while leaving different amounts of space in front of the lens. That affects where a small bounce card fits, whether the camera casts a shadow and how close the crew must work to delicate props.
Practical Macro Challenges
- Focus: Depth of field becomes very limited at high magnification.
- Movement: Small vibrations or subject shifts become prominent.
- Lighting: The lens and camera can obstruct the light near the subject.
- Exposure: Close-focus extension can affect effective aperture and transmission; check the actual lens and exposure.
- Continuity: Record magnification, camera position and prop placement when matching inserts.
Example on Set
A prop department supplies a coin for an extreme close-up. Before choosing the camera position, the camera team checks whether the required detail is achievable at the lens’s maximum magnification. If a tighter image is needed than 1:1 provides, moving a normal lens closer than its focusing limit will not solve the problem.
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Frequently Asked Questions
Are 1× macro and 1:1 macro different?
No. They describe the same reproduction ratio.
Does every lens labelled macro reach 1:1?
No. Check the stated maximum magnification. Some close-focusing lenses stop short of life-size, while specialist macro systems go beyond it.
Related Terms
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