DOF and focal reducers at

Go Back   DV Info Net > The Tools of DV and HD Production > Open DV Discussion

Open DV Discussion
For topics which don't fit into any of the other categories.

Thread Tools Search this Thread
Old March 25th, 2014, 12:08 AM   #1
Major Player
Join Date: May 2007
Location: San Jose, California
Posts: 810
DOF and focal reducers

I understand the mechanisms behind focal reducers, but I'm not sure about it's effects on depth of field. If it improves the light transmission by a stop, does it also give the equivalent DOF of a 1-stop faster lens? In other words, an f2.8 with a focal reducer might give me the transmissive equivalent of an f1.8, but does the depth remain the same as the f2.8 lens?

I'm assuming it would, since the reducer is simply shrinking (and concentrating) the image circle, not affecting the true aperature or any other factors that determine DOF.
Oren Arieli is offline   Reply

DV Info Net refers all where-to-buy and where-to-rent questions exclusively to these trusted full line dealers and rental houses...

Professional Video
(800) 833-4801
Portland, OR

Omega Broadcast
(512) 251-7778
Austin, TX

(973) 335-4460
Mountain Lakes, NJ

Abel Cine Tech
(888) 700-4416
N.Y. NY & L.A. CA

(800) 238-8480
Glendale, CA

Precision Camera
(800) 677-1023
Austin, TX

DV Info Net also encourages you to support local businesses and buy from an authorized dealer in your neighborhood.
  You are here: DV Info Net > The Tools of DV and HD Production > Open DV Discussion

Thread Tools Search this Thread
Search this Thread:

Advanced Search



All times are GMT -6. The time now is 02:04 PM.

DV Info Net -- Real Names, Real People, Real Info!
1998-2015 The Digital Video Information Network