Messagepar rascal » Mer 24 Nov 2010 20:14
@how :
'Focus-by-wire' manual focus
The most unusual feature of this lens's operation is the focus-by-wire manual focus system, which drives the focusing group indirectly via the lens's autofocus motor (as opposed to the direct mechanical connection found in most lenses). As a consequence, the feel of the manual focus ring never changes, regardless of whether the camera is set to auto or manual focus, or the focus has reached the limits of its travel (either close or infinity), and this lack of tactile feedback can be a little disconcerting in some situations.
One slight concern we noted with this lens was a tendency for the image to 'jump' laterally when changing the direction of rotation of the focus ring, which was distinctly visible when focusing manually in magnified live view mode
pas tout compris mais y'a une MaP manuelle, un peu bizarre apparemment...
The magnificients 7s ! D7, D700, D7000
Sony HX5V, Nikon 18-55VR, AFS 24-70/2.8, AI 135/3.5, AFS 200/2 VR, Sigmund 500/4,5 HSM, tokina 100 macro. Bague allonges kenko, rotule benro GH2, Benro BH1 Manfrotto 141RC, 128RC, 804RC2, tripod 190 nat, monopode 679...