Floating elements
One or more elements in a lens which adjust position relative to other components during focusing or zooming. Used to maintain correction of lens aberrations at all settings.
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Floating Elements
On of the most underestimated effect on image quality is the performance deterioration towards closer focus distances. Curvature of field becomes significantly pronounced here and reduce the sharpness towards the image borders.
It may be of interest to note that when using a floating element lens on a bellows or other extension accessory, it is optically preferable to extend the lens to it's fullest extension (nearest focus setting) before extending the bellows.
Well, you use what are called floating elements. As you focus the lens, the elements of the lens move around in relation to each other in order for compensate aberrations at different focus distances.
Through 'Floating Element' designs -wherein each lens group moves independently to achieve focusing- CRC enables selected Nikkor lenses to provide comparable performance at both very near and very far focusing distances.
By using floating elements in a lens or a floating camera sensor and gyroscopic stabiliztion (or faking it digitally), many modern lenses and most modern cameras have made it easier to get better image quality by reducing camera shake.
To overcome this problem, Nikon invented the Close-Range Correction (CRC) System, sometimes called the "Floating Element" system.
This means today's $5,000 LEICA SUMILUX-M 35mm f/1.4 ASPH mit floating element group, the $4,500 1994-2010 LEICA SIUMMILUX-M 35mm f/1.4 ASPH and even LEICA's original SUMMILUX 35mm f/1.4 from 1960-1995 all have only fair bokeh.
the other hand, Mamiya suggests a center filter for their 43mm M7 lens, which has the distinction of being symmetrical thanks to the RF camera. I don't know of a retrofocus lens for LF. Retrofocus designs are asymmetric and require floating elements ...
Lesson 13: Floating elements (floats) "
An element can be floated to the right or to left by using the property float
Lesson 14: Positioning of elements "
With CSS positioning, you can place an element exactly where you want it on your page.
 See also: Element, Lens, Focus, Focusing, Light
  
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