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.
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.
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.
the new Sigma 17-35mm / F2,8-4 EX ASPH. or theTokina 17 mm /F3,5 with asph. lens and floating elements or the Canon EF 20 mm/2,8 with floating elements or the Sigma 28 mm /F1,8 ASPH.? (or something else?) ...
This Canon not only is aspherical like the NOCT- Nikkor, it also has floating elements, which Nikon doesn't. (I haven't tried the newest Nikon 50mm AFS just yet, but it's still a traditional spherical, not advanced aspherical, design.) ...
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, Floating element, Lens, Light, Image
  
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