One would expect that reducing the focal length of the objective lens in this manner would reduce the distance between the red and blue focus as a proportion of the cut off or remaining focal length of the objective lens over the short focus of the reducer, but not so
What does F stand for?
F stands for Focal length (photography)
This definition appears very frequently and is found in the following Acronym Finder categories:
- Science, medicine, engineering, etc.
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Samples in periodicals archive:
Its variable focal length allows a maximum spot position to be set at any focal length within a 42mm range.
The expansion alters the lens' focal length and diminishes transmitted light, Lyon says.
Questar's motorised StepZoom 180 is an 8:1 variable focal length lens with what the company describes as the longest focal length available in an optic of its size.
That downward tug flattens the droplet, increasing its focal length by up to 30 percent as the voltage is raised.
The HV7517 series lenses are designed for 1/2" CCTV cameras and have a focal length of 7.