Posted 13 July 2010 - 02:21 PM
Is there such a lens that keeps everything on focus, i.e. has no DOF ?
Posted 13 July 2010 - 02:41 PM
Some very wide angle lenses have no focus ring. As an example, I have an Angenieux 10mm f1.8 c-mount I use with my Bolex and an ARRI bayonet mount Kinoptik Tegea 5.7mm f1.8 that I use with my ARRI S. Neither has a focus ring. They're called retrofocus lenses.
Posted 13 July 2010 - 05:43 PM
There are also tricks that can help bring more of the scene into focus or bring key parts of it into focus. See this wiki on the sheimpflug principle to read about the most key of those tricks. The scheimpflug principle governs how we use tilt-shift lenses and bellows systems (including lensbabies) and how still photographers use view cameras.
Posted 13 July 2010 - 07:48 PM
The lens was a big hit in the late 90's early 00's and used on a lot of ads where the scale difference between two objects could be played with if they both were in focus. So for example an insect in foreground and person in background looked the same size.
Frazier won a technical acadamy award for it, but some sort of patent lawsuit disaster in 2003 brought him into disrepute. I don't know if Panavision still rents the lens out.
Posted 13 July 2010 - 10:39 PM
and a video demo:
Posted 14 July 2010 - 06:15 PM