If I use a 1.4x tele-converter on a 400mm lens, does the depth of field behave like a 400mm or a 560mm lens?
It behaves like a 560mm lens, but remember the aperture changes, and if you do not have a Canon TC the display will not report the true f/stop. For example, a 400/5.6 wide open with a 1.4 TC is for all purposes, a 500/8.
Using the DOF calculator at http://www.outsight.com/hyperfocal.html (the near-far section) shows that at a focus distance of 40 feet, DOF with a 400/5.6 is 11.9 inches, with a 560/8 it's 8.5", and with a 560/5.6 it would be six inches.
--
Warren Marts <[EMAIL PROTECTED]> -- Socorro, NM, USA
Lover of travel, languages, good beer/wine, and anything with a motor
"There's two kinds of fools: one says 'This is old, and therefore good,'
and the other says 'This is new, and therefore better.'" - John Brunner
* **** ******* *********************************************************** * For list instructions, including unsubscribe, see: * http://www.a1.nl/phomepag/markerink/eos_list.htm ***********************************************************
