filter to alter depth of field

[Stefano Stroppa]

Is there such a filter that allows you to focus only on small part of the frame, (not necessarily in the middle, using a very wide lens (and working with f/stop around 2.8)?

any experience with any of these filters?

the scene is the following: frontal shot of the nurse holding a big siring, I want to focus on the big distorted needle in the very foreground, blurring the rest of the image, and being able to rack focus to the character. Can I do it with a filter on set and not in post?

thank you so much :)

[Gregory Irwin]

What about swing and tilt lenses?

 

G

[Mark Dunn]

Or a split dioptre, which is half a closeup lens. The rest of the filter mount is empty.

http://www.ebay.co.uk/itm/NEW-4-5-DIOPTER-SPLIT-1-2-Schneider-Filter-Close-Up-Filters-4-1-2-Tiffen-/350724117593?pt=LH_DefaultDomain_0&hash=item51a8c95459

Or a macro lens which will focus very close then rack out.

The "very wide lens" you speak of may focus close enough anyway.

Edited May 16, 2015 by Mark Dunn