Videomaker – Learn video production and editing, camera reviews › Forums › Technique › Miscellaneous Techniques › Depth of Field › To decrease the depth of f
To decrease the depth of field:
1. Use long focus (zoom in)
2. Try to use macro mode
3. Open iris up as much as possible. Some cameramen speed up the shutter to compensate for proper exposure, I recommend use ND filter.
There is extra hard core article with 3-store formulas in Wikipedia: http://en.wikipedia.org/wiki/Depth_of_field
See if it works for you.