The DF lenses allow a control of the DOF behind and after the subject.
Something a bit more complicated than a diffusion ring. BTW with the DF
control OFF they are among the sharpest Nikon lenses.
marco
----------
>Da: Gary Schloss <schloss@xxxxxxxxxxxxxx>
>A: olympus@xxxxxxxxxxxxxxx
>Oggetto: Re: [OM] Soft Lens
>Data: Gio, 8 apr 1999 4:43
>
> AFAIK, in the past both Minolta and Pentax also had 85mm "soft focus"
> lenses -- in manual focus only. Nikon still offers two DC (Defocus
> Control) lenses: 105/f2 and 135/f2, both in AF. Several MF equipment
> makers also offer soft focus portrait lenses. To my knowledge, all
> of the above are able to _gradually_ change the amount of "softness"
> in the pict., but I'm not sure how this feature is implemented inside
> the lens.
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