Ashton wrote: Well, we mostly use... 300mm Macro-sironar f/5.6's... For... lighting... using up to 20-25K watt seconds to get proper depth of field.
DOF depends on magnification and relative aperture does it not? Do you therefore get a better DOF with a longer lens if you can stop it down more, for the same magnification? The digital significance is that you do not need so much magnification, as you can get adequate detail with a small or medium format CCD. A "gentleman" told us the other day that due to the small size of CCDs and the large aperture we can work at (and are advised to avoid diffraction) "all the pros" are chucking in their powerful flash systems. Could you give us the arithmetic of the exposure - distance flash to subject and loss of power in the softbox and diffuser, aperture etc? My Rodenstock goes up to f209! =============================================================== GO TO http://www.prodig.org for ~ GUIDELINES ~ un/SUBSCRIBING ~ ITEMS for SALE
